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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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#41
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Combi boiler - condensing - or not?
"Tony Bryer" wrote in message ... On Fri, 17 Mar 2006 15:54:23 -0000 Doctor Drivel wrote : Chav, you really are a dumbo. Here is the GasTec report: http://www.zenexenergy.com/downloads/Final%20GasTec%20report%20for%20Zenex.pdf Which says that during the summer season you can expect to cut your DHW energy usage by 12%. On a modern house DHW is responsible for about one third of energy use and most of this will be during the heating season (greater part of year and colder water coming in). "Added to this figure should be the instantaneous saving of ~2.47% that this achieved whilst the boiler is operational in DHW mode. The total saving is thus projected to be ~(38+2.47) % ie fractionally in excess of 40%. It is a thermal store of condensate. In CH running the wasted heat heats the store of water to ~50-60C. As they said in most cases of small DHW draw-offs the vast majority of heat will come from this small store. So, in winter much of the wasted CH heat is reclaimed, and it is then used for DHW use. There are clear gain. When makers are attempting to grap the extra 1 litre/min of the competition, this is a real quantum jump in efficiency. With some clever piping and controls this could also be used to boost UFH as well. |
#42
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Combi boiler - condensing - or not?
Andy Hall wrote:
For heating running for a third of the day, the implication would be of 5.5kWh per day. However, it's unlikely that all of the heat could be recovered - perhaps 30% - so we are talking about say 2kWh/day. Why only 30%? Genuine question. If you run gases in opposite directions you always have a thermal gradient between incoming and outgoing gas which makes countercurrent heat exchangers potentially very effective. This works out to about £15/year. Unless more than 30% is attainable. Of course, this is estimation, but I think it's reasonable approximation within half an order of magnitude There are other places to obtain a better ROI. Not if you can knock one up for £15. ;-) Bit of plastic drain pipe and a SS exhaust cutoff from the local Quikfit. Tim |
#43
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Combi boiler - condensing - or not?
On Fri, 17 Mar 2006 17:03:26 -0000, "Tim Downie"
wrote: Andy Hall wrote: For heating running for a third of the day, the implication would be of 5.5kWh per day. However, it's unlikely that all of the heat could be recovered - perhaps 30% - so we are talking about say 2kWh/day. Why only 30%? Genuine question. If you run gases in opposite directions you always have a thermal gradient between incoming and outgoing gas which makes countercurrent heat exchangers potentially very effective. This works out to about £15/year. Unless more than 30% is attainable. OK, so even if it's 50 or 60%, it's still marginal. Of course, this is estimation, but I think it's reasonable approximation within half an order of magnitude There are other places to obtain a better ROI. Not if you can knock one up for £15. ;-) Bit of plastic drain pipe and a SS exhaust cutoff from the local Quikfit. Possibly, but unless you had a long length of it, you wouldn't get the surface area needed to achieve the transfer. Think about heat exchangers inside boilers and also plate heat exchangers for heating water. These have huge surface areas by comparison. -- ..andy |
#44
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Combi boiler - condensing - or not?
On Fri, 17 Mar 2006 19:22:02 +0000 Andy Hall wrote :
Possibly, but unless you had a long length of it, you wouldn't get the surface area needed to achieve the transfer. Think about heat exchangers inside boilers and also plate heat exchangers for heating water. These have huge surface areas by comparison. I assume that what is envisaged is an insulated doughnut containing combi pre-heat water with a length of ss flue passing though the middle so that the heat from the flue pre-heats the water. A key problem ISTM is that when the boiler stops you have this doughnut of warm water but if you don't make use of it pretty quickly it will lose heat back into the flue to the outside cold air. Likewise on one of those spring or autumn days that is nice and mild but cold at night this heat exchanger will turn into a pre-cooler. -- Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk Free SEDBUK boiler database browser http://www.sda.co.uk/qsedbuk.htm [Latest version QSEDBUK 1.12 released 8 Dec 2005] |
#45
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Combi boiler - condensing - or not?
On Thu, 16 Mar 2006 14:03:59 -0800, CharlieR wrote:
Hi - I'm new to this forum but would appreciate some helpful advice. I live in a flat and am having the kitchen refitted, which means moving or replacing our existing boiler (Alpha Ocean Style FF - about 12 yrs old). I'm told that if we replace it we have to have a condensing boiler (new building regs), but I understand that there are problems with the plume from this type of boiler as we have a balcony roof above where the flue would exit, and it's close to a door and a window. The cheaper option is to just move the Alpha, but I'm worried this may affect it (cause leaks). Or can we get a new non-condensing boiler fitted? I've spoken to 4 different heating companies (incl BG) and have had different comments and advice from each. Any help much appreciated. Thanks. Look over the BoilerCHoice FAQ it may help. -- Ed Sirett - Property maintainer and registered gas fitter. The FAQ for uk.diy is at http://www.diyfaq.org.uk Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html |
#46
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Combi boiler - condensing - or not?
Doctor Drivel wrote:
Chav, you really are a dumbo. Here is the GasTec report: http://www.zenexenergy.com/downloads/Final%20GasTec%20report%20for%20Zenex.pdf Chump, gullible could have been a word made for you... Look at the hot water draw off pattern they used for testing. Lots of unrealistically small 1.8l bursts that could be satisfied from the stored water. For many instalations you will use 1.8l just running off the dead leg. 24l for a shower - great if you only want 2 mins in there - but remember some folks might actually want to get clean. What about baths - even your mythical 100L bath will make a big dent in those figures. They also seem to be assuming that a 30kW combi will be running at that power output into the CH for three hours a day in order to have enough captured waste heat in the first place. Not exactly a realistic scenario is it. Still realism was never your strong point was it. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#47
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Combi boiler - condensing - or not?
On Fri, 17 Mar 2006 20:57:58 +0000, John Rumm
wrote: Doctor Drivel wrote: Chav, you really are a dumbo. Here is the GasTec report: http://www.zenexenergy.com/downloads/Final%20GasTec%20report%20for%20Zenex.pdf Chump, gullible could have been a word made for you... Look at the hot water draw off pattern they used for testing. Lots of unrealistically small 1.8l bursts that could be satisfied from the stored water. For many instalations you will use 1.8l just running off the dead leg. 24l for a shower - great if you only want 2 mins in there - but remember some folks might actually want to get clean. What about baths - even your mythical 100L bath will make a big dent in those figures. They also seem to be assuming that a 30kW combi will be running at that power output into the CH for three hours a day in order to have enough captured waste heat in the first place. Not exactly a realistic scenario is it. Still realism was never your strong point was it. It's amazing what a manufacturer can achieve by paying for a test report. -- ..andy |
#48
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Combi boiler - condensing - or not?
"John Rumm" wrote in message ... Doctor Drivel wrote: Chav, you really are a dumbo. Here is the GasTec report: http://www.zenexenergy.com/downloads/Final%20GasTec%20report%20for%20Zenex.pdf Chump, gullible Chav, take it with a respected Gas test house in Holland if your Chavness thinks otherwise. |
#49
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Combi boiler - condensing - or not?
"John Rumm" wrote in message ... Not exactly a realistic scenario is it. Still realism was never your strong point was it. Chav, you must read again. You are clearly not a very bright person. |
#50
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Combi boiler - condensing - or not?
"Andy Hall" aka Matt wrote in message ... On Fri, 17 Mar 2006 20:57:58 +0000, John Rumm wrote: Doctor Drivel wrote: Chav, you really are a dumbo. Here is the GasTec report: http://www.zenexenergy.com/downloads/Final%20GasTec%20report%20for%20Zenex.pdf Chump, gullible could have been a word made for you... Look at the hot water draw off pattern they used for testing. Lots of unrealistically small 1.8l bursts that could be satisfied from the stored water. For many instalations you will use 1.8l just running off the dead leg. 24l for a shower - great if you only want 2 mins in there - but remember some folks might actually want to get clean. What about baths - even your mythical 100L bath will make a big dent in those figures. They also seem to be assuming that a 30kW combi will be running at that power output into the CH for three hours a day in order to have enough captured waste heat in the first place. Not exactly a realistic scenario is it. Still realism was never your strong point was it. It's amazing what a manufacturer can achieve by paying for a test report. Matt, yep, an objective report. Amazing isn't it. |
#51
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Combi boiler - condensing - or not?
Andy Hall wrote:
Not exactly a realistic scenario is it. Still realism was never your strong point was it. It's amazing what a manufacturer can achieve by paying for a test report. Yup, just define the criteria so that it is narrow enough, cough up the cash and you can get away with murder.... after all it worked on Hutton! -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#52
Posted to uk.d-i-y
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Combi boiler - condensing - or not?
On Fri, 17 Mar 2006 22:16:47 -0000, "Doctor Drivel"
wrote: "Andy Hall" aka Matt wrote in message .. . On Fri, 17 Mar 2006 20:57:58 +0000, John Rumm wrote: Doctor Drivel wrote: Chav, you really are a dumbo. Here is the GasTec report: http://www.zenexenergy.com/downloads/Final%20GasTec%20report%20for%20Zenex.pdf Chump, gullible could have been a word made for you... Look at the hot water draw off pattern they used for testing. Lots of unrealistically small 1.8l bursts that could be satisfied from the stored water. For many instalations you will use 1.8l just running off the dead leg. 24l for a shower - great if you only want 2 mins in there - but remember some folks might actually want to get clean. What about baths - even your mythical 100L bath will make a big dent in those figures. They also seem to be assuming that a 30kW combi will be running at that power output into the CH for three hours a day in order to have enough captured waste heat in the first place. Not exactly a realistic scenario is it. Still realism was never your strong point was it. It's amazing what a manufacturer can achieve by paying for a test report. Matt, yep, an objective report. Amazing isn't it. Remind me to email you some other product reports and the number of one of my offshore accounts so that you can make the payment for your purchases. Do you buy Lottery tickets at all? -- ..andy |
#53
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Combi boiler - condensing - or not?
On Fri, 17 Mar 2006 22:30:37 +0000, John Rumm
wrote: Andy Hall wrote: Not exactly a realistic scenario is it. Still realism was never your strong point was it. It's amazing what a manufacturer can achieve by paying for a test report. Yup, just define the criteria so that it is narrow enough, cough up the cash and you can get away with murder.... after all it worked on Hutton! It certainly did. Literally..... -- ..andy |
#54
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Combi boiler - condensing - or not?
On Fri, 17 Mar 2006 22:14:14 -0000, "Doctor Drivel"
wrote: "John Rumm" wrote in message ... Doctor Drivel wrote: Chav, you really are a dumbo. Here is the GasTec report: http://www.zenexenergy.com/downloads/Final%20GasTec%20report%20for%20Zenex.pdf Chump, gullible Chav, take it with a respected Gas test house in Holland if your Chavness thinks otherwise. Don't be silly. You can give a commission to any test house or consulting firm and define the criteria in such a way as to produce the outcome that you want to have for marketing purposes. They do need to tell any lies, but the results will not be objective either. I suppose that you believe advertorials in magazines as well.... -- ..andy |
#55
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Combi boiler - condensing - or not?
"Andy Hall" aka Matt wrote in message ... On Fri, 17 Mar 2006 22:14:14 -0000, "Doctor Drivel" wrote: "John Rumm" wrote in message ... Doctor Drivel wrote: Chav, you really are a dumbo. Here is the GasTec report: http://www.zenexenergy.com/downloads/Final%20GasTec%20report%20for%20Zenex.pdf Chump, gullible Chav, take it with a respected Gas test house in Holland if your Chavness thinks otherwise. Don't be silly. You can give a commission to any test house or consulting firm and define the criteria in such a way as to produce the outcome that you want to have for marketing purposes. They do need to tell any lies, but the results will not be objective either. Matt, have you any evidence of this firm skulduggery? |
#56
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Combi boiler - condensing - or not?
On Sat, 18 Mar 2006 00:02:16 -0000, "Doctor Drivel"
wrote: "Andy Hall" aka Matt wrote in message .. . On Fri, 17 Mar 2006 22:14:14 -0000, "Doctor Drivel" wrote: "John Rumm" wrote in message ... Doctor Drivel wrote: Chav, you really are a dumbo. Here is the GasTec report: http://www.zenexenergy.com/downloads/Final%20GasTec%20report%20for%20Zenex.pdf Chump, gullible Chav, take it with a respected Gas test house in Holland if your Chavness thinks otherwise. Don't be silly. You can give a commission to any test house or consulting firm and define the criteria in such a way as to produce the outcome that you want to have for marketing purposes. They do need to tell any lies, but the results will not be objective either. Matt, have you any evidence of this firm skulduggery? OK. One more time. Take a read through the report. Properly. "Testwork" "Zenex retained GaC to determine the energy savings possible from the Energy GasSaver." This means that Zenex paid Gastec to do test work and produce a report. It was not that Gastec did this independently and out of the goodness of their hearts. The basic pattern of use of the heating that was assumed is not reasonable, and neither is the volume of hot water use. Much of the rest of the report is based on theoretical assumptions which the author points out should be verified experimentally. Nobody is suggesting any impropriety in what was actually done. However, the measurements and assumptions are a long way from practical use and the further experiments recommended were not done as part of this work. In other words, it's the minimum amount to suggest some promise in the product (but not under realistic conditions of use). The comprehensive work to actually establish useful data experimentally was either not carried out or not included in the report. It doesn't have a lot of real value. -- ..andy |
#57
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Combi boiler - condensing - or not?
"Andy Hall" akak Matt wrote in message ... On Sat, 18 Mar 2006 00:02:16 -0000, "Doctor Drivel" wrote: "Andy Hall" aka Matt wrote in message . .. On Fri, 17 Mar 2006 22:14:14 -0000, "Doctor Drivel" wrote: "John Rumm" wrote in message ... Doctor Drivel wrote: Chav, you really are a dumbo. Here is the GasTec report: http://www.zenexenergy.com/downloads/Final%20GasTec%20report%20for%20Zenex.pdf Chump, gullible Chav, take it with a respected Gas test house in Holland if your Chavness thinks otherwise. Don't be silly. You can give a commission to any test house or consulting firm and define the criteria in such a way as to produce the outcome that you want to have for marketing purposes. They do need to tell any lies, but the results will not be objective either. Matt, have you any evidence of this firm skulduggery? OK. One more time. Matt, so you haven't then. |
#58
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Combi boiler - condensing - or not?
"Andy Hall" wrote in message news On Sat, 18 Mar 2006 11:04:12 -0000, "Doctor Drivel" wrote: "Andy Hall" akak Matt wrote in message . .. On Sat, 18 Mar 2006 00:02:16 -0000, "Doctor Drivel" wrote: "Andy Hall" aka Matt wrote in message m... On Fri, 17 Mar 2006 22:14:14 -0000, "Doctor Drivel" wrote: "John Rumm" wrote in message ... Doctor Drivel wrote: Chav, you really are a dumbo. Here is the GasTec report: http://www.zenexenergy.com/downloads/Final%20GasTec%20report%20for%20Zenex.pdf Chump, gullible Chav, take it with a respected Gas test house in Holland if your Chavness thinks otherwise. Don't be silly. You can give a commission to any test house or consulting firm and define the criteria in such a way as to produce the outcome that you want to have for marketing purposes. They do need to tell any lies, but the results will not be objective either. Matt, have you any evidence of this firm skulduggery? OK. One more time. Matt, so you haven't then. Just read the report. If you can't figure out the fallacies Matt, you are not a position to recognise fallacies. |
#59
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Combi boiler - condensing - or not?
CharlieR wrote:
Hi - I'm new to this forum but would appreciate some helpful advice. I live in a flat and am having the kitchen refitted, which means moving or replacing our existing boiler (Alpha Ocean Style FF - about 12 yrs old). I'm told that if we replace it we have to have a condensing boiler (new building regs), but I understand that there are problems with the plume from this type of boiler as we have a balcony roof above where the flue would exit, and it's close to a door and a window. The cheaper option is to just move the Alpha, but I'm worried this may affect it (cause leaks). Or can we get a new non-condensing boiler fitted? I've spoken to 4 different heating companies (incl BG) and have had different comments and advice from each. Any help much appreciated. Thanks. as a budding(30 year old) gas/heating engineeer and plumber, i would bite the bullit and go for the condenser, do you live on top floor? if so have you got sole access to loft? if so stck it up there out of the way! if not, and plume will cause problems, as said before look through the regs and find a good way of avoiding 'em or move it yourself! |
#60
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Combi boiler - condensing - or not?
Gav wrote:
CharlieR wrote: Hi - I'm new to this forum but would appreciate some helpful advice. I live in a flat and am having the kitchen refitted, which means moving or replacing our existing boiler (Alpha Ocean Style FF - about 12 yrs old). I'm told that if we replace it we have to have a condensing boiler (new building regs), but I understand that there are problems with the plume from this type of boiler as we have a balcony roof above where the flue would exit, and it's close to a door and a window. The cheaper option is to just move the Alpha, but I'm worried this may affect it (cause leaks). Or can we get a new non-condensing boiler fitted? I've spoken to 4 different heating companies (incl BG) and have had different comments and advice from each. Any help much appreciated. Thanks. as a budding(30 year old) gas/heating engineeer and plumber, i would bite the bullit and go for the condenser, do you live on top floor? if so have you got sole access to loft? if so stck it up there out of the way! if not, and plume will cause problems, as said before look through the regs and find a good way of avoiding 'em or move it yourself! if you email me i will forward the info i have on deciding where to site the flue |
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