Rogertheart Posted May 7, 2013 Share Posted May 7, 2013 If you increase the temperature of the mains water before it gets to your boiler, e.g. by 5 degrees, does this mean you will use less power to heat up the water. Link to comment Share on other sites More sharing options...
mafya Posted May 7, 2013 Share Posted May 7, 2013 It depends on what it costs to heat up the water and how much you are actually saving. Welcome to the forum! Link to comment Share on other sites More sharing options...
Rogertheart Posted May 7, 2013 Author Share Posted May 7, 2013 If it costs only a £40 one-off payment, would a 10 degrees increase at the inlet make much of a difference ? Link to comment Share on other sites More sharing options...
Waypher Posted May 7, 2013 Share Posted May 7, 2013 If you increase the temperature of the mains water before it gets to your boiler, e.g. by 5 degrees, does this mean you will use less power to heat up the water. How do you propose to heat it before it gets to the boiler? Link to comment Share on other sites More sharing options...
Garbo Posted May 7, 2013 Share Posted May 7, 2013 If you increase the temperature of the mains water before it gets to your boiler, e.g. by 5 degrees, does this mean you will use less power to heat up the water. yes, thats why you get more hot water out of your electric shower in summer than winter Link to comment Share on other sites More sharing options...
anywebsite Posted May 7, 2013 Share Posted May 7, 2013 Yes, but you'd need to get the energy from somewhere to heat the water before it gets to your boiler. Solar? It's going to depend how much hot water you use & what boiler you have how long it'll take to pay back the £40. Probably wont take long. This is assuming the energy used to heat the water first is 'free', like a solar thermal panel or something. If you're fitting an electric heater before your gas boiler then it'll be less efficient & cost more. Link to comment Share on other sites More sharing options...
Obelix Posted May 8, 2013 Share Posted May 8, 2013 If you increase the temperature of the mains water before it gets to your boiler, e.g. by 5 degrees, does this mean you will use less power to heat up the water. No. you will still need the same energy (power is not the same as energy) to heat the water up. You will need to supply less energy from the boiler, but the total energy into the water will be the same. If you can preheat the water very cheaply beforehand then that's worth doing. It is actaully very effective to have a zigzag pipe arrangement on a south facing wall painted matt black before it goes into an instant gas hot water heater for example. Of course in winter the pipes freeze and burst.... Link to comment Share on other sites More sharing options...
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