Replacing a Traditional Floor Standing Boiler with a Wall Mounted System Boiler
Posted: Wed Nov 26, 2014 9:55 pm
Hi,
I want to replace a traditional floor-standing gas boiler (pumped radiators and gravity fed hot water system) with a new wall mounted system boiler.
I’ve checked the plumbing behind the boiler and am reasonably confident that that I’ve identified the various pipes. There’s an out and return pair that I believe go up to the upstairs radiators, and there’s 2nd pair that go under the floor to the downstairs radiators. There’s also a pair of very large pipes one of which goes up into the ceiling, I believe this is the gravity feed to the hot water tank, I think this goes into the ceiling, under the upstairs floor, across to the airing cupboard down through the boiler, and then back across the scullery floor to the boiler.
I’ve had an engineer out to quote for a new boiler, what I don’t understand is he’s quite insistent that the old gravity pipes to/from the hot water tank will need to be replaced, but to be honest I just don’t understand why. I understand that the new system will have to all pumped, I understand that a valve will need to be installed to control the flow of water between radiator circuits and the hot water tank, but I just don’t understand why the water can’t be pumped through the old gravity pipes? The engineer was talking about ripping up the floor and ceiling for new pipes, all of which costs time and money (and mess). The engineer seemed quite genuine, but without a full understanding of the issues I was a little suspicious I was being fed a line, the best answers I could get out of him was that the ‘design isn’t up to modern standards’ and ‘the pipes need to be upgraded’ but without any explanation that I could understand.
A second question is am I better off with a System boiler, or a traditional ‘standard’ boiler? The house and radiators probably date from the 70’s or 80’s I understand that system boilers operate at higher pressure than standard boilers, and I’ve read that there’s a danger of the increased pressure causing leaks in an old system. Do system boilers really offer any advantages over standard boilers, other than dispensing with the tank in the attic? Would I be best to just replace with another ‘standard’ boiler, rather than risking the extra pressure?
Thanks
I want to replace a traditional floor-standing gas boiler (pumped radiators and gravity fed hot water system) with a new wall mounted system boiler.
I’ve checked the plumbing behind the boiler and am reasonably confident that that I’ve identified the various pipes. There’s an out and return pair that I believe go up to the upstairs radiators, and there’s 2nd pair that go under the floor to the downstairs radiators. There’s also a pair of very large pipes one of which goes up into the ceiling, I believe this is the gravity feed to the hot water tank, I think this goes into the ceiling, under the upstairs floor, across to the airing cupboard down through the boiler, and then back across the scullery floor to the boiler.
I’ve had an engineer out to quote for a new boiler, what I don’t understand is he’s quite insistent that the old gravity pipes to/from the hot water tank will need to be replaced, but to be honest I just don’t understand why. I understand that the new system will have to all pumped, I understand that a valve will need to be installed to control the flow of water between radiator circuits and the hot water tank, but I just don’t understand why the water can’t be pumped through the old gravity pipes? The engineer was talking about ripping up the floor and ceiling for new pipes, all of which costs time and money (and mess). The engineer seemed quite genuine, but without a full understanding of the issues I was a little suspicious I was being fed a line, the best answers I could get out of him was that the ‘design isn’t up to modern standards’ and ‘the pipes need to be upgraded’ but without any explanation that I could understand.
A second question is am I better off with a System boiler, or a traditional ‘standard’ boiler? The house and radiators probably date from the 70’s or 80’s I understand that system boilers operate at higher pressure than standard boilers, and I’ve read that there’s a danger of the increased pressure causing leaks in an old system. Do system boilers really offer any advantages over standard boilers, other than dispensing with the tank in the attic? Would I be best to just replace with another ‘standard’ boiler, rather than risking the extra pressure?
Thanks