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
|
|||
|
|||
Turning the boiler up to increase efficiency??
I heard some bloke at an energy efficiency company advising people to
turn their boiler control UP (leaving their room and cylinder stats alone). ie: If the switch on the boiler went 1-6 and it was at 3, turn it to 4 or 4.5. He said this is because the boiler gets hotter quicker, heats the tank quicker, and reduces cycling. Thus saving energy. But won't this mess with the condensing point of a condensing boiler? His argument is: tank calls for heat, boiler and pump start, boiler reaches temp and turns off, tank still wants heat, pump still goes, primary side water and boiler cool, hence the waste. It all just doesn't quite sound right, somehow! |
#2
Posted to uk.d-i-y
|
|||
|
|||
Turning the boiler up to increase efficiency??
On 2007-09-04 07:05:02 +0100, Jonathan said:
I heard some bloke at an energy efficiency company advising people to turn their boiler control UP (leaving their room and cylinder stats alone). ie: If the switch on the boiler went 1-6 and it was at 3, turn it to 4 or 4.5. He said this is because the boiler gets hotter quicker, heats the tank quicker, and reduces cycling. Thus saving energy. That might be true with a conventional boiler if the cylinder is able to accept all of the boiler output. But won't this mess with the condensing point of a condensing boiler? There isn't a Holy Grail at the condensing point. Nirvana isn't achieved. All that happens is that the *rate* of increasing efficiency with reducing temperature increases - i.e. a knee in the curve. His argument is: tank calls for heat, boiler and pump start, boiler reaches temp and turns off, tank still wants heat, pump still goes, primary side water and boiler cool, hence the waste. It all just doesn't quite sound right, somehow! It's a jumble. If it's a modulating model (typically should be), a cool water cylinder will present a substantial heat load and the boiler will run balls out condensing heavily because the return water is cool. For a radiator load with TRVs reducing flow, the boiler will modulate down to match the load. |
#3
Posted to uk.d-i-y
|
|||
|
|||
Turning the boiler up to increase efficiency??
"Jonathan" wrote in message ups.com... I heard some bloke at an energy efficiency company advising people to turn their boiler control UP (leaving their room and cylinder stats alone). ie: If the switch on the boiler went 1-6 and it was at 3, turn it to 4 or 4.5. He said this is because the boiler gets hotter quicker, heats the tank quicker, and reduces cycling. Thus saving energy. But won't this mess with the condensing point of a condensing boiler? During DHW is stored at high temperatures and at kleast 60C for the prvention of legionella. When re-heating the boier temperature has to be hot. You can't get away from it. Condnesing boier or not it has to be hot. The only boier know that condenses wt all tiomes when supplying DHW is the ACV Heatmaster, which has a unique combied tank-in-tank/boiler. A class act. His argument is: tank calls for heat, boiler and pump start, boiler reaches temp and turns off, tank still wants heat, pump still goes, primary side water and boiler cool, hence the waste. The heat exchanger has to take all of the boilers output. The best heat exchange is a plate heat exchanger and bronze pump using a direct cylinder Works out cheaper than a cylinder with a quick recovery coil in many cases. Glow Worm in their new Extramax and Ultramax boilers use this method to reheat an integral unvented cylinder. These plates extract so much heat from the boiler it can really lower the return temperature to condensing levels for most of re-heat time. He is generally right. But, the cylinder coil has to take the boilers output. On re-heating from cold a Part L cylinder will take the output of the average boiler when set to 80C for the initial part of the re-heat, until the return temperature is raised. The problem is having the boiler at the ideal temperaure for CH to promote condesning efficiency. An outside weather compensator can do this. Boilers are available that will re-heat water at full belt and switch to weather compensation on CH. Even so external waether compensators and the odd reply can do this too. It all just doesn't quite sound right, somehow! The best is a heat bank in which the bottom CH half is heated by a weather compensator. The boiler operates in a superior full flow through the heat exchanger hydraulic environment, as does the CH circuit too. Boilers last far longer when heating heat banks. |
#4
Posted to uk.d-i-y
|
|||
|
|||
Turning the boiler up to increase efficiency??
Doctor Drivel wrote:
"Jonathan" wrote in message ups.com... I heard some bloke at an energy efficiency company advising people to turn their boiler control UP (leaving their room and cylinder stats alone). ie: If the switch on the boiler went 1-6 and it was at 3, turn it to 4 or 4.5. He said this is because the boiler gets hotter quicker, heats the tank quicker, and reduces cycling. Thus saving energy. But won't this mess with the condensing point of a condensing boiler? During DHW is stored at high temperatures and at kleast 60C for the prvention of legionella. When re-heating the boier temperature has to be hot. You can't get away from it. Condnesing boier or not it has to be hot. The only boier know that condenses wt all tiomes when supplying DHW is the ACV Heatmaster, which has a unique combied tank-in-tank/boiler. A class act. His argument is: tank calls for heat, boiler and pump start, boiler reaches temp and turns off, tank still wants heat, pump still goes, primary side water and boiler cool, hence the waste. The heat exchanger has to take all of the boilers output. The best heat exchange is a plate heat exchanger and bronze pump using a direct cylinder Works out cheaper than a cylinder with a quick recovery coil in many cases. Glow Worm in their new Extramax and Ultramax boilers use this method to reheat an integral unvented cylinder. These plates extract so much heat from the boiler it can really lower the return temperature to condensing levels for most of re-heat time. He is generally right. But, the cylinder coil has to take the boilers output. On re-heating from cold a Part L cylinder will take the output of the average boiler when set to 80C for the initial part of the re-heat, until the return temperature is raised. The problem is having the boiler at the ideal temperaure for CH to promote condesning efficiency. An outside weather compensator can do this. Boilers are available that will re-heat water at full belt and switch to weather compensation on CH. Even so external waether compensators and the odd reply can do this too. It all just doesn't quite sound right, somehow! The best is a heat bank in which the bottom CH half is heated by a weather compensator. The boiler operates in a superior full flow through the heat exchanger hydraulic environment, as does the CH circuit too. Boilers last far longer when heating heat banks. What course did you go on, to talk bollockese? Dave |
#5
Posted to uk.d-i-y
|
|||
|
|||
Turning the boiler up to increase efficiency??
"Dave" wrote in message ... Dave Oh PatnDave..the pefect couple. |
#6
Posted to uk.d-i-y
|
|||
|
|||
Turning the boiler up to increase efficiency??
Doctor Drivel wrote:
"Dave" wrote in message ... Dave Oh PatnDave..the pefect couple. We almost are. Not that any couple is perfect. She is an expert in humanity things and I am somewhat a bull **** detector :-) Dave |
#7
Posted to uk.d-i-y
|
|||
|
|||
Turning the boiler up to increase efficiency??
On 2007-09-07 19:17:40 +0100, Dave said:
Doctor Drivel wrote: "Dave" wrote in message ... Dave Oh PatnDave..the pefect couple. We almost are. Not that any couple is perfect. She is an expert in humanity things and I am somewhat a bull **** detector :-) Dave So this was like falling off of a log then? ;-) |
#8
Posted to uk.d-i-y
|
|||
|
|||
Turning the boiler up to increase efficiency??
"Dave" wrote in message ... Doctor Drivel wrote: "Dave" wrote in message ... Dave Oh PatnDave..the pefect couple. We almost are. Not that any couple is perfect. She is an expert in humanity things and I am somewhat a bull **** detector :-) ...the perfect couple then...PatnDave. Are you to be on Richard & Judy? |
#9
Posted to uk.d-i-y
|
|||
|
|||
Turning the boiler up to increase efficiency??
"Andy Hall" wrote in message ... On 2007-09-07 19:17:40 +0100, Dave said: Doctor Drivel wrote: "Dave" wrote in message ... Dave Oh PatnDave..the pefect couple. We almost are. Not that any couple is perfect. She is an expert in humanity things and I am somewhat a bull **** detector :-) Dave So this was like falling off of a log then? ;-) I'm sure they fall off lots of logs. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Which boiler system for efficiency? | UK diy | |||
Baxi boiler efficiency | UK diy | |||
Boiler efficiency question | UK diy | |||
Oil burner and Boiler - Modifications to increase efficiency | Home Repair | |||
Boiler efficiency? | Home Repair |