Home |
Search |
Today's Posts |
|
UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
Reply |
|
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
Grrr. This is why I prefer proper stored hot water systems...
My shower has a mira Discovery thermostatic mixer, one of these: http://goo.gl/0n7g Try as I might I can't actually get the hot water to be hot. With the temperature control turned all the way to "hot" it just runs tepid, I end up shivering when trying to have a shower. Following the instructions I've turned the internal temperature control adjuster within the green temperture hub, I've ended up turning it so far the worm scren is starting to poke out of the hub, yet it *STILL* runs cold. Basin mixer tap runs nice and hot, kitchen mixer tap runs nice and hot. Any advice? At the place I used to live I had 25 gallons of hot water sat waiting for me instantly onstandby. JGH |
#2
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
My shower has a mira Discovery thermostatic mixer, one of
these:http://goo.gl/0n7g Sorry, no, actually one of these: http://goo.gl/rRg4 |
#3
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
jgharston wrote:
My shower has a mira Discovery thermostatic mixer, one of these: http://goo.gl/rRg4 PS: Boiler is a oil-fired Warmflow Combi 90, serviced in June. JGH |
#4
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
On 26/10/2010 19:38, jgharston wrote:
Grrr. This is why I prefer proper stored hot water systems... My shower has a mira Discovery thermostatic mixer, one of these: http://goo.gl/0n7g Try as I might I can't actually get the hot water to be hot. With the temperature control turned all the way to "hot" it just runs tepid, I end up shivering when trying to have a shower. Following the instructions I've turned the internal temperature control adjuster within the green temperture hub, I've ended up turning it so far the worm scren is starting to poke out of the hub, yet it *STILL* runs cold. Basin mixer tap runs nice and hot, kitchen mixer tap runs nice and hot. Any advice? At the place I used to live I had 25 gallons of hot water sat waiting for me instantly onstandby. JGH If the water is hot at the sink then it's not the boiler or the system. It must be the shower mixer. I've had one of those showers and it was fine. Has it ever worked? Are the hot and cold supply fitted correctly? Is there a blockage in the hot supply? If you stop cold water reaching the shower does hot water come out? |
#5
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
nicknoxx wrote:
If the water is hot at the sink then it's not the boiler or the system. It must be the shower mixer. I've had one of those showers and it was fine. Has it ever worked? Not since I moved in in May. It's only now getting annoying as the weather gets colder. Are the hot and cold supply fitted correctly? Dunno, can only presume that the person who built/plumbed the house last year fitted them correctly. Is there a blockage in the hot supply? If you stop cold water reaching the shower does hot water come out? Hmm. That would be an interesting experiment, though how I would do it without ripping out the wall on the other side of the shower or breaking up the concrete floor I'm not sure. JGH |
#6
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
On 26/10/2010 20:13, jgharston wrote:
nicknoxx wrote: If the water is hot at the sink then it's not the boiler or the system. It must be the shower mixer. I've had one of those showers and it was fine. Has it ever worked? Not since I moved in in May. It's only now getting annoying as the weather gets colder. Are the hot and cold supply fitted correctly? Dunno, can only presume that the person who built/plumbed the house last year fitted them correctly. Is there a blockage in the hot supply? If you stop cold water reaching the shower does hot water come out? Hmm. That would be an interesting experiment, though how I would do it without ripping out the wall on the other side of the shower or breaking up the concrete floor I'm not sure. JGH Hmmm, looks like you'll have to have the shower mixer off the wall then |
#7
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
On 26/10/2010 19:38, jgharston wrote:
Any advice? Turn it half way and stick your hand under it. Then turn it up gradually and feel what happens. Then report back! Andy |
#8
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
Andy Champ wrote:
Turn it half way and stick your hand under it. *Then turn it up gradually and feel what happens. *Then report back! At halfway, runs at 37degrees. After 30 seconds turned up to full hot. Continued running at 37 degress. JGH |
#9
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
jgharston wrote:
At halfway, runs at 37degrees. After 30 seconds turned up to full hot. Continued running at 37 degress. Hot water in the basin runs at 47 degrees. JGH |
#10
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
"Andy Champ" wrote in message
. uk... On 26/10/2010 19:38, jgharston wrote: Any advice? Turn it half way and stick your hand under it. Then turn it up gradually and feel what happens. Then report back! Andy Can you check the temp at a tap whilst the shower is running? You may be 'blaming' the shower when it is the boiler that is lacking capacity. I have a Mira 415 and I needed to fit a flow reducer in the winter to allow the boiler to cope - it was delivering 12 litres a minute and the boiler struggled. It is now 9 litres a minute and it is fine |
#11
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
"John" wrote in message
... "Andy Champ" wrote in message . uk... On 26/10/2010 19:38, jgharston wrote: Any advice? Turn it half way and stick your hand under it. Then turn it up gradually and feel what happens. Then report back! Andy Can you check the temp at a tap whilst the shower is running? You may be 'blaming' the shower when it is the boiler that is lacking capacity. I have a Mira 415 and I needed to fit a flow reducer in the winter to allow the boiler to cope - it was delivering 12 litres a minute and the boiler struggled. It is now 9 litres a minute and it is fine I realise now that your has a "flow" control (mine doesn't). Is the problem there at lower flow rates? |
#12
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
On 27/10/2010 7:38 a.m., jgharston wrote:
Grrr. This is why I prefer proper stored hot water systems... My shower has a mira Discovery thermostatic mixer, one of these: http://goo.gl/0n7g Try as I might I can't actually get the hot water to be hot. With the temperature control turned all the way to "hot" it just runs tepid, I end up shivering when trying to have a shower. Following the instructions I've turned the internal temperature control adjuster within the green temperture hub, I've ended up turning it so far the worm scren is starting to poke out of the hub, yet it *STILL* runs cold. Basin mixer tap runs nice and hot, kitchen mixer tap runs nice and hot. Any advice? At the place I used to live I had 25 gallons of hot water sat waiting for me instantly onstandby. JGH Possibly the pressure in the hot system is too low. We had a new cylinder installed recently and at first the pressure was too low - hot water in the basins, but the shower mixer dropped the flow right down. The plumber came back and cranked up the pressure reducing valve (whatever it's called), and now it's fine. |
#13
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
Gib Bogle wrote:
Possibly the pressure in the hot system is too low. *We had a new cylinder installed recently and at first the pressure was too low - hot water in the There's no cylinder, that's what's annoying. I'm used to a cylinder with 25 gallons of hot water sitting there waiting for me to use it at any time, not waiting for a boiler to suddenly wake up and desperately try to heat the water as it rushes past it. basins, but the shower mixer dropped the flow right down. *The plumber came back and cranked up the pressure reducing valve (whatever it's called), and now it's fine. That might do it. I'll have a chat with the landlord (or see if I can find it myself). JGH |
#14
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
"Gib Bogle" wrote in message
... On 27/10/2010 7:38 a.m., jgharston wrote: Grrr. This is why I prefer proper stored hot water systems... My shower has a mira Discovery thermostatic mixer, one of these: http://goo.gl/0n7g Try as I might I can't actually get the hot water to be hot. With the temperature control turned all the way to "hot" it just runs tepid, I end up shivering when trying to have a shower. Following the instructions I've turned the internal temperature control adjuster within the green temperture hub, I've ended up turning it so far the worm scren is starting to poke out of the hub, yet it *STILL* runs cold. Basin mixer tap runs nice and hot, kitchen mixer tap runs nice and hot. Any advice? At the place I used to live I had 25 gallons of hot water sat waiting for me instantly onstandby. JGH Possibly the pressure in the hot system is too low. We had a new cylinder installed recently and at first the pressure was too low - hot water in the basins, but the shower mixer dropped the flow right down. The plumber came back and cranked up the pressure reducing valve (whatever it's called), and now it's fine. Trace the pipes - do you perhaps have mains cold on one side and gravity hot on the other? |
#15
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
On Tue, 26 Oct 2010 22:12:32 +0100, John wrote:
I have a Mira 415 and I needed to fit a flow reducer in the winter to allow the boiler to cope - it was delivering 12 litres a minute and the boiler struggled. It is now 9 litres a minute and it is fine I realise now that your has a "flow" control (mine doesn't). Is the problem there at lower flow rates? Good test and I'd go with lack of capacity in the boiler especially as it's only since the supply started getting colder that the problem has appeared. Another thing is the OP not finding a "safety interlock" that prevents the shower going above 38C or 43C (ie cold to tepid) unless defeated. Though it doesn't look like this one has such a "feature". -- Cheers Dave. |
#16
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
Gib Bogle wrote:
On 27/10/2010 7:38 a.m., jgharston wrote: Grrr. This is why I prefer proper stored hot water systems... My shower has a mira Discovery thermostatic mixer, one of these: http://goo.gl/0n7g Try as I might I can't actually get the hot water to be hot. With the temperature control turned all the way to "hot" it just runs tepid, I end up shivering when trying to have a shower. Following the instructions I've turned the internal temperature control adjuster within the green temperture hub, I've ended up turning it so far the worm scren is starting to poke out of the hub, yet it *STILL* runs cold. Basin mixer tap runs nice and hot, kitchen mixer tap runs nice and hot. Any advice? At the place I used to live I had 25 gallons of hot water sat waiting for me instantly onstandby. JGH Possibly the pressure in the hot system is too low. Its combi dear. There is no 'hot water' system as such. |
#17
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
In article
, jgharston wrote: Grrr. This is why I prefer proper stored hot water systems... My shower has a mira Discovery thermostatic mixer, one of these: http://goo.gl/0n7g Try as I might I can't actually get the hot water to be hot. With the temperature control turned all the way to "hot" it just runs tepid, I end up shivering when trying to have a shower. Following the instructions I've turned the internal temperature control adjuster within the green temperture hub, I've ended up turning it so far the worm scren is starting to poke out of the hub, yet it *STILL* runs cold. It seems to be designed for either low or high pressure systems. Assuming yours is high pressure being a combi perhaps the cold flow is too great for the mixer to compensate for? You could prove that quite easily by cutting it down on the main stop cock. -- *Why do we say something is out of whack? What is a whack? Dave Plowman London SW To e-mail, change noise into sound. |
#18
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
John wrote:
Trace the pipes Don't want to dig up the concrete floor or bash holes in the stud walls. do you perhaps have mains cold on one side and gravity hot on the other? No, it's a combi with no cylinder - ie mains cold, mains hot. JGH |
#19
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
Dave Plowman (News) wrote:
It seems to be designed for either low or high pressure systems. Assuming yours is high pressure being a combi perhaps the cold flow is too great for the mixer to compensate for? You could prove that quite easily by cutting it down on the main stop cock. Yes, that heats it up. However, it also cuts the flow (!) just as I've always experienced with non-stored systems. You throw away water flow in exchange for heat, and the cross-over point is always too crap for either. It just manages to get up to 44 degrees with water running out at a trickle. Proper decent pressure gives a temperature of 35 degrees, brrrr!!!! Just after the stop-tap there's an inline connector with a nut on the side that I've never seen before, looks a bit like this: http://plumbworld.co.uk/compression-...check-222-3991 This is a new-build house in Aberdeenshire, it's about 18 months old. JGH |
#20
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
On 27/10/2010 12:04 p.m., The Natural Philosopher wrote:
Gib Bogle wrote: On 27/10/2010 7:38 a.m., jgharston wrote: Grrr. This is why I prefer proper stored hot water systems... My shower has a mira Discovery thermostatic mixer, one of these: http://goo.gl/0n7g Try as I might I can't actually get the hot water to be hot. With the temperature control turned all the way to "hot" it just runs tepid, I end up shivering when trying to have a shower. Following the instructions I've turned the internal temperature control adjuster within the green temperture hub, I've ended up turning it so far the worm scren is starting to poke out of the hub, yet it *STILL* runs cold. Basin mixer tap runs nice and hot, kitchen mixer tap runs nice and hot. Any advice? At the place I used to live I had 25 gallons of hot water sat waiting for me instantly onstandby. JGH Possibly the pressure in the hot system is too low. Its combi dear. There is no 'hot water' system as such. I don't follow you, sweetheart. We had low pressure at all the hot taps, good pressure on the cold. After adjustment of the diaphragm thingie on the hw cylinder inlet, we now have good pressure on all hot taps. OK darling? |
#21
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
Gib Bogle wrote:
I don't follow you, sweetheart. *We had low pressure at all the hot taps, good pressure on the cold. *After adjustment of the diaphragm thingie on the hw cylinder inlet, we now have good pressure on all hot taps. *OK darling? ^^^^^^^^^^^^^^^^ Exactly sweetie, I *don't* have a hot water cylinder, hot water is supplied on demand by being heated as the cold water flows through the boiler. If it flows flowly enough to be heated to a useful temparture, it's flowing too slowly for a decent shower. If it's flowing fast enough for a decent shower, it's flowing through the boiler too fast for it to be heated up, escpecially now that the cold supply arrives at 8 degrees since the snow stared. This is why I hate non-stored hot water systems. JGH |
#22
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
On 27/10/2010 1:01 p.m., jgharston wrote:
Gib Bogle wrote: I don't follow you, sweetheart. We had low pressure at all the hot taps, good pressure on the cold. After adjustment of the diaphragm thingie on the hw cylinder inlet, we now have good pressure on all hot taps. OK darling? ^^^^^^^^^^^^^^^^ Exactly sweetie, I *don't* have a hot water cylinder, hot water is supplied on demand by being heated as the cold water flows through the boiler. If it flows flowly enough to be heated to a useful temparture, it's flowing too slowly for a decent shower. If it's flowing fast enough for a decent shower, it's flowing through the boiler too fast for it to be heated up, escpecially now that the cold supply arrives at 8 degrees since the snow stared. This is why I hate non-stored hot water systems. JGH That's the first time I've heard of a 'combi' system. Sometimes posting to uk.d-i-y from NZ does make a difference. |
#23
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
On 27 Oct, 00:46, Gib Bogle wrote:
On 27/10/2010 12:04 p.m., The Natural Philosopher wrote: Gib Bogle wrote: On 27/10/2010 7:38 a.m., jgharston wrote: Grrr. This is why I prefer proper stored hot water systems... My shower has a mira Discovery thermostatic mixer, one of these:http://goo.gl/0n7g Try as I might I can't actually get the hot water to be hot. With the temperature control turned all the way to "hot" it just runs tepid, I end up shivering when trying to have a shower. Following the instructions I've turned the internal temperature control adjuster within the green temperture hub, I've ended up turning it so far the worm scren is starting to poke out of the hub, yet it *STILL* runs cold. Basin mixer tap runs nice and hot, kitchen mixer tap runs nice and hot. Any advice? At the place I used to live I had 25 gallons of hot water sat waiting for me instantly onstandby. JGH Possibly the pressure in the hot system is too low. Its combi dear. There is no 'hot water' system as such. I don't follow you, sweetheart. *We had low pressure at all the hot taps, good pressure on the cold. *After adjustment of the diaphragm thingie on the hw cylinder inlet, we now have good pressure on all hot taps. *OK darling?- Hide quoted text - - Show quoted text - If it's a combi, there is no cylinder. |
#24
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
harry wrote:
If it's a combi, there is no cylinder. Not neccessarily. At my old place I had a combi boiler with hot water cylinder. I specifically specified keeping the cylinder when the old boiler was replaced specifically to avoid the crapness we've been discussing. JGH |
#25
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
Gib Bogle wrote:
On 27/10/2010 12:04 p.m., The Natural Philosopher wrote: Gib Bogle wrote: On 27/10/2010 7:38 a.m., jgharston wrote: Grrr. This is why I prefer proper stored hot water systems... My shower has a mira Discovery thermostatic mixer, one of these: http://goo.gl/0n7g Try as I might I can't actually get the hot water to be hot. With the temperature control turned all the way to "hot" it just runs tepid, I end up shivering when trying to have a shower. Following the instructions I've turned the internal temperature control adjuster within the green temperture hub, I've ended up turning it so far the worm scren is starting to poke out of the hub, yet it *STILL* runs cold. Basin mixer tap runs nice and hot, kitchen mixer tap runs nice and hot. Any advice? At the place I used to live I had 25 gallons of hot water sat waiting for me instantly onstandby. JGH Possibly the pressure in the hot system is too low. Its combi dear. There is no 'hot water' system as such. I don't follow you, sweetheart. We had low pressure at all the hot taps, good pressure on the cold. After adjustment of the diaphragm thingie on the hw cylinder inlet, we now have good pressure on all hot taps. OK darling? combis dont have hot water tanks |
#26
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
Gib Bogle wrote:
On 27/10/2010 1:01 p.m., jgharston wrote: Gib Bogle wrote: I don't follow you, sweetheart. We had low pressure at all the hot taps, good pressure on the cold. After adjustment of the diaphragm thingie on the hw cylinder inlet, we now have good pressure on all hot taps. OK darling? ^^^^^^^^^^^^^^^^ Exactly sweetie, I *don't* have a hot water cylinder, hot water is supplied on demand by being heated as the cold water flows through the boiler. If it flows flowly enough to be heated to a useful temparture, it's flowing too slowly for a decent shower. If it's flowing fast enough for a decent shower, it's flowing through the boiler too fast for it to be heated up, escpecially now that the cold supply arrives at 8 degrees since the snow stared. This is why I hate non-stored hot water systems. JGH That's the first time I've heard of a 'combi' system. with luck, it will be the last as well. spawn of the devil. A combi is to what we used to call a 'geyser' as a wimnd turbione is to a traditional windmill. I.e. a really crap idea dressed up in modern clothes and sold on the basis that it actually does something useful after all. The only 'combi' I have used that really worked for hot water, was the one my sister had in germany. It lived in the basement and was the size of a family car. That actually could produce a hot shower. Sometimes posting to uk.d-i-y from NZ does make a difference. |
#27
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
jgharston wrote:
harry wrote: If it's a combi, there is no cylinder. Not neccessarily. At my old place I had a combi boiler with hot water cylinder. I specifically specified keeping the cylinder when the old boiler was replaced specifically to avoid the crapness we've been discussing. Then why did you bother with a combi boiler? JGH |
#28
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
"jgharston" wrote in message
... Dave Plowman (News) wrote: It seems to be designed for either low or high pressure systems. Assuming yours is high pressure being a combi perhaps the cold flow is too great for the mixer to compensate for? You could prove that quite easily by cutting it down on the main stop cock. Yes, that heats it up. However, it also cuts the flow (!) just as I've always experienced with non-stored systems. You throw away water flow in exchange for heat, and the cross-over point is always too crap for either. It just manages to get up to 44 degrees with water running out at a trickle. Proper decent pressure gives a temperature of 35 degrees, brrrr!!!! Just after the stop-tap there's an inline connector with a nut on the side that I've never seen before, looks a bit like this: http://plumbworld.co.uk/compression-...check-222-3991 This is a new-build house in Aberdeenshire, it's about 18 months old. JGH My combi based installation has a couple of valves in the loft that can be crudely used to adjust flow. The hot one suffered from the washer swelling and restricting the flow. |
#29
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
In article ,
The Natural Philosopher wrote: I don't follow you, sweetheart. We had low pressure at all the hot taps, good pressure on the cold. After adjustment of the diaphragm thingie on the hw cylinder inlet, we now have good pressure on all hot taps. OK darling? combis dont have hot water tanks I'm amazed dribble hasn't been here yet. ;-) Don't some store a small amount of hot water to get over the initial wait from those without? No reason why you couldn't heat a cylinder from a combi. And keep the 'instant' feature for the kitchen tap. -- *If your feet smell and your nose runs, you're built upside down. Dave Plowman London SW To e-mail, change noise into sound. |
#30
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
"Dave. ;-)
Don't some store a small amount of hot water to get over the initial wait from those without? My Worcester Heatslave floor standing one had this feature - the problem was though that the stored water was hotter than what the boiler could produce for a shower which meant that the shower started off really hot using the stored water and then got a bit cooler. However - never a big problem - more one of it being too hot to start with. |
#31
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
On 26 Oct, 19:38, jgharston wrote:
Grrr. This is why I prefer proper stored hot water systems... My shower has a mira Discovery thermostatic mixer, one of these:http://goo.gl/0n7g Try as I might I can't actually get the hot water to be hot. With the temperature control turned all the way to "hot" it It's a TMV and comes factory set to a (low) maximum temperature (43 deg or so typically) which is low enough not to cause scalding to elderly or disabled people if installed in a care home or such. The idea is the makers don't get sued when a numpty plumber causes scalding to someone's granny. You can alter the maximum temperature, usually involves taking knobs off and such. See manufacturer's installation instructions. |
#32
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
On 27 Oct, 10:09, Onetap wrote:
On 26 Oct, 19:38, jgharston wrote: Grrr. This is why I prefer proper stored hot water systems... My shower has a mira Discovery thermostatic mixer, one of these:http://goo.gl/0n7g Try as I might I can't actually get the hot water to be hot. With the temperature control turned all the way to "hot" it It's a TMV and comes factory set to a (low) maximum temperature (43 deg or so typically) which is low enough not to cause scalding to elderly or disabled people if installed in a care home or such. The idea is the makers don't get sued when a numpty plumber causes scalding to someone's granny. You can alter the maximum temperature, usually involves taking knobs off and such. See manufacturer's installation instructions. No, ignore that. You've done it. probably unequal pressures or a defective cartridge. |
#33
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
Dave Plowman (News) wrote:
In article , The Natural Philosopher wrote: I don't follow you, sweetheart. We had low pressure at all the hot taps, good pressure on the cold. After adjustment of the diaphragm thingie on the hw cylinder inlet, we now have good pressure on all hot taps. OK darling? combis dont have hot water tanks I'm amazed dribble hasn't been here yet. ;-) Don't some store a small amount of hot water to get over the initial wait from those without? No reason why you couldn't heat a cylinder from a combi. And keep the 'instant' feature for the kitchen tap. No reason why you would install a combi with hot water storage. The reason combis exist, is that the cost of a combi is less than a conventional lower powered boiler plus hot water tank, plus shower pump plus header tank. Or less than a conenvtional boiler plus mains pressure tank. Once you start adding heat banks or a cylinder to a combi, to make it work better, the cost then exceeds a conventional boiler and mains pressure tank. |
#34
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
"Dave Plowman (News)" wrote in message ... No reason why you couldn't heat a cylinder from a combi. And keep the 'instant' feature for the kitchen tap. Not a lot of point doing that, you just need to insulate the tank and pipes and use a non combi bolier. A hot water cylinder is just a dedicated heat store and has the same advantages (unless its a bungaloo). |
#35
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
On Oct 26, 9:31*pm, jgharston wrote:
jgharston wrote: At halfway, runs at 37degrees. After 30 seconds turned up to full hot. Continued running at 37 degress. Hot water in the basin runs at 47 degrees. That's not very hot either. It there a thermostat on the boiler that controls the outlet temperature? What is the boiler's rated power? Robert |
#36
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
"jgharston" wrote in message ... Gib Bogle wrote: Possibly the pressure in the hot system is too low. We had a new cylinder installed recently and at first the pressure was too low - hot water in the There's no cylinder, that's what's annoying. I'm used to a cylinder with 25 gallons of hot water sitting there waiting for me to use it at any time, not waiting for a boiler to suddenly wake up and desperately try to heat the water as it rushes past it. basins, but the shower mixer dropped the flow right down. The plumber came back and cranked up the pressure reducing valve (whatever it's called), and now it's fine. That might do it. I'll have a chat with the landlord (or see if I can find it myself). Ah! Are you in Scotland by any chance? It's possible that there's been a thermostatic mixing valve installed somewhere (that pre-dates the present shower control valve) that's restricting maximum HW temp. Tim |
#37
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
"jgharston" wrote in message ... Gib Bogle wrote: Possibly the pressure in the hot system is too low. We had a new cylinder installed recently and at first the pressure was too low - hot water in the There's no cylinder, that's what's annoying. I'm used to a cylinder with 25 gallons of hot water sitting there waiting for me to use it at any time, not waiting for a boiler to suddenly wake up and desperately try to heat the water as it rushes past it. basins, but the shower mixer dropped the flow right down. The plumber came back and cranked up the pressure reducing valve (whatever it's called), and now it's fine. That might do it. I'll have a chat with the landlord (or see if I can find it myself). ######################################### Are you in Scotland by any chance? It's possible that there's been a thermostatic mixing valve installed somewhere (that pre-dates the present shower control valve) that's restricting maximum HW temp. Tim |
#38
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
On 27 Oct, 13:30, "dennis@home" wrote:
"Dave Plowman (News)" wrote in ... No reason why you couldn't heat a cylinder from a combi. And keep the 'instant' feature for the kitchen tap. Interesting - I've yet to find a combi supplied kitchen tap that was 'instant'. I have a traditional system, and get hot water through in reasonable time and with good flow - I think every house I've been into in which the hot water is combi supplied, the wait has been extensive and the flow weak. Rob |
#39
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
robgraham wrote:
On 27 Oct, 13:30, "dennis@home" wrote: "Dave Plowman (News)" wrote in ... No reason why you couldn't heat a cylinder from a combi. And keep the 'instant' feature for the kitchen tap. Interesting - I've yet to find a combi supplied kitchen tap that was 'instant'. I have a traditional system, and get hot water through in reasonable time and with good flow - I think every house I've been into in which the hot water is combi supplied, the wait has been extensive and the flow weak. Correct. You need something like a 50KW combi to heat hot water really fast. Which then needs to run at much less to do CH. Which is why the better designs modulate down. But even so, efficiency is poor. And the requrements are quite different as well. Optimal outflow for modern radiators in not freezing temps might be as low as 35-40C. Optimum hot water as far as I am concerned is 60C or so. Rob |
#40
Posted to uk.d-i-y
|
|||
|
|||
Getting hot water from shower to actually be hot
On 26/10/10 22:12, John wrote:
I realise now that your has a "flow" control (mine doesn't). Is the problem there at lower flow rates? Google for E-on showersave. They were doing a promo with Anglian Water where they were sending these out free. Fits in line with the shower hose or shower head and limits the flow rate to around 9l/min. |
Reply |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Water hammer causing black water in sink/toilet/shower? | Home Repair | |||
Shower with Main cold water and cylinder hot water | UK diy | |||
Help: Sink Water Hot, Shower Water Not | Home Repair | |||
no hot water in the shower | Home Repair | |||
shower-pump/pump for cold water to shower only ? | UK diy |