Can anyone see anything wrong with this idea please? Could i connect the hot water supply from a modern combi boiler, and the hot water supply from a traditional gravity fed hot water tank (two independent haeating systems), through an appopriate two-way valve, and so be able to switch between hot supplies? Many thanks.
Can I have two sources of hot water connected to same line?
- Thread starter GaryPalmer
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You could manually do that by closing one and opening the other being careful not to have both open together.
Does not exactly comply with Water regulations.
The hot supply will be low pressure and mains pressure depending on which one is open so showers etc will not work well in one of the positions.
Most will say its not a very good idea. Wait until the wife or kids get it wrong and cause problems!
Tony
Does not exactly comply with Water regulations.
The hot supply will be low pressure and mains pressure depending on which one is open so showers etc will not work well in one of the positions.
Most will say its not a very good idea. Wait until the wife or kids get it wrong and cause problems!
Tony
Professional answer NO NO NO NO!!!! 
If your concern is to have a backup system (ie a cylinder of water heated by an immersion heater) available if (when) the combi fails, why not use an instantaneous electric shower fed from the mains cold supply.
If it's because a combi does not deliver sufficient hot water for your needs, then the question is whether a combi is really the right choice for you and your household.
If you wish to take advantage of multiple heat sources, then maybe set up your two supplies with , say, the kitchen fed by the combi, main bathroom from cylinder, second bathroom from combi etc. etc.
As Tony said, the two systems operate at entirely different water pressures, so operating any mixers will be problematic at best, and possibly downright dangerous (Images of the combi backfeeding mains pressure hot water into cylinder, which may burst, or the hot water ends up in the cold storage tank, which overheats and collapses)
If it's because a combi does not deliver sufficient hot water for your needs, then the question is whether a combi is really the right choice for you and your household.
If you wish to take advantage of multiple heat sources, then maybe set up your two supplies with , say, the kitchen fed by the combi, main bathroom from cylinder, second bathroom from combi etc. etc.
As Tony said, the two systems operate at entirely different water pressures, so operating any mixers will be problematic at best, and possibly downright dangerous (Images of the combi backfeeding mains pressure hot water into cylinder, which may burst, or the hot water ends up in the cold storage tank, which overheats and collapses)
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Tickly, he has a wood burner which he wants to use for hot water during the winter!
The simple answer is that it will work ( with some probvlems ) but is not a very good idea.
He says he has a CORGI engineer installing the combi, hopefully he will be able to give him on site advice. We are a little concerned because he seems rather vague about flue clearance distances.
Tony
The simple answer is that it will work ( with some probvlems ) but is not a very good idea.
He says he has a CORGI engineer installing the combi, hopefully he will be able to give him on site advice. We are a little concerned because he seems rather vague about flue clearance distances.
Tony
which has exactly jack to do with this thread
Thanks for the advice, all advice taken and appreciated. Though I never did intend to physically connect a combi output into a hot water tank as has been assumed, please give me a little credit. The idea was to find a way to switch between the two outputs, as stated in my original thread, not having both feeding at the same time. I imagined something like a non-return valve (one way) on the tank output, an non-return valve on the combi output, both connected to a switchable valve. There must be many households that have more than one heating system?
I live in an old, cold, damp house in an area where wood fuel is on my doorstep and is free. However I also acknowledge the convenience of having a combi boiler (and LPG is not cheap) and am in a situation where I can potentially have both heating systems. I guess I am the type of person who looks for viable, safe, compliant and well considered solutions (hence this thread), not problems.
Thanks again.
I live in an old, cold, damp house in an area where wood fuel is on my doorstep and is free. However I also acknowledge the convenience of having a combi boiler (and LPG is not cheap) and am in a situation where I can potentially have both heating systems. I guess I am the type of person who looks for viable, safe, compliant and well considered solutions (hence this thread), not problems.
Thanks again.
This valve can switch between two outlets.
http://www.intaeco.co.uk/resources/solar/intasol_installer.pdf
It's designed for solar/combi boiler integration. The valve though won't know whether the water is pre heated by solar energy or solid fuel.
You would need a HW coil in a thermal store to supply the valve.
Your combi needs to be capable of accepting 28c pre heated water.
http://www.intaeco.co.uk/resources/solar/intasol_installer.pdf
It's designed for solar/combi boiler integration. The valve though won't know whether the water is pre heated by solar energy or solid fuel.
You would need a HW coil in a thermal store to supply the valve.
Your combi needs to be capable of accepting 28c pre heated water.
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