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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. |
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#1
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Hot water problem after drain down
Hi,
I've got a problem with the hot water in my house which I'd really appreciate it if anyone could shed some light on. Background - House is ~20 years old and all I know about the boiler is it's a Baxi and I think from the piping that it's a direct boiler system as the description I found here seems to fit http://www.diydoctor.org.uk/projects...er%20s ystem: .. There's no thermostats on the system it's just time based and the boiler runs both the Central Heating and hot water. Problem - I drained down the water today to have a look at a problem with a shower valve. I did this by turning off the boiler at the control then closing the mains water valve and running the hot and cold taps in the bathrooms till they ran out. After looking at the shower I opened the mains water valve and left it to refill the tanks. Now the cold water system is working fine, but there doesn't appear to be any hot water coming from the taps. The central heating works fine and the pilot light on the boiler seems lit. If I check the pipes running to the hot water tank when the hot water is on they seem to be warm to the touch and also I've checked the small cold water tank at the back of the hot water tank (which seems to feed the tank) and there is water in that ok. I'm guessing that there's something obvious that I'm missing here, so if anyone can point me in the right direction that'd be great Thanks Rory |
#2
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Hot water problem after drain down
In an earlier contribution to this discussion,
raesene wrote: Hi, I've got a problem with the hot water in my house which I'd really appreciate it if anyone could shed some light on. Background - House is ~20 years old and all I know about the boiler is it's a Baxi and I think from the piping that it's a direct boiler system as the description I found here seems to fit http://www.diydoctor.org.uk/projects...er%20s ystem: . There's no thermostats on the system it's just time based and the boiler runs both the Central Heating and hot water. I'm not sure what you mean by a "direct boiler system". You will almost certainly *not* have a direct HW cylinder - but an indirect one - like the right-hand picture in the above reference. This has an internal coil through which water from the boiler passes, heating the surrounding water in the cylinder without mixing with it. Unless you have a (diabolical!) primatic cylinder, the primary (boiler/heating coil/radiators) circuit is entirely separate from the secondary domestic hot water circuit - each having its own cold header tank. Problem - I drained down the water today to have a look at a problem with a shower valve. I did this by turning off the boiler at the control then closing the mains water valve and running the hot and cold taps in the bathrooms till they ran out. After looking at the shower I opened the mains water valve and left it to refill the tanks. Now the cold water system is working fine, but there doesn't appear to be any hot water coming from the taps. The central heating works fine and the pilot light on the boiler seems lit. If I check the pipes running to the hot water tank when the hot water is on they seem to be warm to the touch and also I've checked the small cold water tank at the back of the hot water tank (which seems to feed the tank) and there is water in that ok. I'm guessing that there's something obvious that I'm missing here, so if anyone can point me in the right direction that'd be great Assuming that you *haven't* got a primatic system, the most likely explanation is that you've got an air-lock in the DHW system. The classical cure for this is to use a hosepipe to connect mains cold water to the outlet of one of the hot taps, forcing water up into the header tank, and clearing any trapped air in the process. But I think we need to bottom out exactly what you *have* got, first. Any chance that you could take a few digital photos of your installation - particularly HW cylinder and header tank(s) - and upload them somewhere, and post a URL here? -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
#3
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Hot water problem after drain down
hi,
Roger Mills wrote: In an earlier contribution to this discussion, raesene wrote: Hi, I've got a problem with the hot water in my house which I'd really appreciate it if anyone could shed some light on. Background - House is ~20 years old and all I know about the boiler is it's a Baxi and I think from the piping that it's a direct boiler system as the description I found here seems to fit http://www.diydoctor.org.uk/projects...er%20s ystem: . There's no thermostats on the system it's just time based and the boiler runs both the Central Heating and hot water. I'm not sure what you mean by a "direct boiler system". You will almost certainly *not* have a direct HW cylinder - but an indirect one - like the right-hand picture in the above reference. This has an internal coil through which water from the boiler passes, heating the surrounding water in the cylinder without mixing with it. Unless you have a (diabolical!) primatic cylinder, the primary (boiler/heating coil/radiators) circuit is entirely separate from the secondary domestic hot water circuit - each having its own cold header tank. Problem - I drained down the water today to have a look at a problem with a shower valve. I did this by turning off the boiler at the control then closing the mains water valve and running the hot and cold taps in the bathrooms till they ran out. After looking at the shower I opened the mains water valve and left it to refill the tanks. Now the cold water system is working fine, but there doesn't appear to be any hot water coming from the taps. The central heating works fine and the pilot light on the boiler seems lit. If I check the pipes running to the hot water tank when the hot water is on they seem to be warm to the touch and also I've checked the small cold water tank at the back of the hot water tank (which seems to feed the tank) and there is water in that ok. I'm guessing that there's something obvious that I'm missing here, so if anyone can point me in the right direction that'd be great Assuming that you *haven't* got a primatic system, the most likely explanation is that you've got an air-lock in the DHW system. The classical cure for this is to use a hosepipe to connect mains cold water to the outlet of one of the hot taps, forcing water up into the header tank, and clearing any trapped air in the process. But I think we need to bottom out exactly what you *have* got, first. Any chance that you could take a few digital photos of your installation - particularly HW cylinder and header tank(s) - and upload them somewhere, and post a URL here? here's some pictures. Here's the boiler http://www.mccune.org.uk/plumb/boiler.jpg here's the controller http://www.mccune.org.uk/plumb/controller.jpg here's a view of the tanks http://www.mccune.org.uk/plumb/tanks2.jpg . The hot water tank is the one on the left hand side the cold water tank is on the right. here's a view of the pipes running to/from the hot water tank http://www.mccune.org.uk/plumb/pipes.jpg the two running away on the left seem to go to the boiler. Here's a view of the small water tank at the back/top of the hot water tank http://www.mccune.org.uk/plumb/flow-tank.jpg Hope this helps answer what it is... Thanks for the help so far :O) -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
#4
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Hot water problem after drain down
In an earlier contribution to this discussion,
raesene wrote: here's some pictures. Here's the boiler http://www.mccune.org.uk/plumb/boiler.jpg here's the controller http://www.mccune.org.uk/plumb/controller.jpg here's a view of the tanks http://www.mccune.org.uk/plumb/tanks2.jpg . The hot water tank is the one on the left hand side the cold water tank is on the right. here's a view of the pipes running to/from the hot water tank http://www.mccune.org.uk/plumb/pipes.jpg the two running away on the left seem to go to the boiler. Here's a view of the small water tank at the back/top of the hot water tank http://www.mccune.org.uk/plumb/flow-tank.jpg Hope this helps answer what it is... Thanks for the help so far :O) Thanks for the pictures. Unfortunately, nothing that I recognise! Do you not also have a hot water cylinder in an airing cupboard? The tank which you describe as the HW tank doesn't look very big to me, and the F&E tank isn't where I would expect it to be, relative to the cylinder. -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
#5
Posted to uk.d-i-y
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Hot water problem after drain down
Roger Mills wrote: In an earlier contribution to this discussion, raesene wrote: here's some pictures. Here's the boiler http://www.mccune.org.uk/plumb/boiler.jpg here's the controller http://www.mccune.org.uk/plumb/controller.jpg here's a view of the tanks http://www.mccune.org.uk/plumb/tanks2.jpg . The hot water tank is the one on the left hand side the cold water tank is on the right. here's a view of the pipes running to/from the hot water tank http://www.mccune.org.uk/plumb/pipes.jpg the two running away on the left seem to go to the boiler. Here's a view of the small water tank at the back/top of the hot water tank http://www.mccune.org.uk/plumb/flow-tank.jpg Hope this helps answer what it is... Thanks for the help so far :O) Thanks for the pictures. Unfortunately, nothing that I recognise! Do you not also have a hot water cylinder in an airing cupboard? The tank which you describe as the HW tank doesn't look very big to me, and the F&E tank isn't where I would expect it to be, relative to the cylinder. Those are the only tanks that I've seen whilst being in the house, and there's definately not any other tanks that I've ever seen in any of the rooms in the house. One quick question. Would it be likely to cause any problems if I tried the remedy for an airlock (putting mains water pressure into one of the hot water taps) regardless? Just thinking it would be useful to eliminate that as a possibility before trying other things/calling out a plumber... Thanks -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
#6
Posted to uk.d-i-y
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Hot water problem after drain down
raesene wrote: Roger Mills wrote: In an earlier contribution to this discussion, raesene wrote: here's some pictures. Here's the boiler http://www.mccune.org.uk/plumb/boiler.jpg here's the controller http://www.mccune.org.uk/plumb/controller.jpg here's a view of the tanks http://www.mccune.org.uk/plumb/tanks2.jpg . The hot water tank is the one on the left hand side the cold water tank is on the right. here's a view of the pipes running to/from the hot water tank http://www.mccune.org.uk/plumb/pipes.jpg the two running away on the left seem to go to the boiler. Here's a view of the small water tank at the back/top of the hot water tank http://www.mccune.org.uk/plumb/flow-tank.jpg Hope this helps answer what it is... Thanks for the help so far :O) Thanks for the pictures. Unfortunately, nothing that I recognise! Do you not also have a hot water cylinder in an airing cupboard? The tank which you describe as the HW tank doesn't look very big to me, and the F&E tank isn't where I would expect it to be, relative to the cylinder. Those are the only tanks that I've seen whilst being in the house, and there's definately not any other tanks that I've ever seen in any of the rooms in the house. One quick question. Would it be likely to cause any problems if I tried the remedy for an airlock (putting mains water pressure into one of the hot water taps) regardless? Just thinking it would be useful to eliminate that as a possibility before trying other things/calling out a plumber... Thanks Just to say that it's fixed now. I went the safe route and got someone out to have a look at it. It was an airlock and all working now! Thanks for the help rory -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
#7
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Hot water problem after drain down
In an earlier contribution to this discussion,
raesene wrote: Just to say that it's fixed now. I went the safe route and got someone out to have a look at it. It was an airlock and all working now! Thanks for the help rory Excellent. Probably the safest thing to do. I wouldn't advise using mains pressure unless you understand the system design and are sure that it will not cause any damage. -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
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