Matthewr Posted February 27 Share Posted February 27 Hi. I'm interested in replacing gas powered warm air heating with ASHP. Link to comment Share on other sites More sharing options...
Redbeard Posted February 27 Share Posted February 27 Welcome. A library near me has kept the original ducting from the gas-fired warm-air system and is now running it with an air-to-air HP. I understand it is performing really well. Of course ASHP does not do domestic HW but I think the standard Johnson and Starley WA boilers require a separate water-heating appliance anyway, don't they? You can get 'heat pump cylinders' with an integral exhaust air HP. Link to comment Share on other sites More sharing options...
SteamyTea Posted February 27 Share Posted February 27 (edited) Welcome. I like Brandford on Avon. There person that convinced me to go to university to study renewable energy moved there (may have moved out now). Is the Dandelion cafe still in business? 58 minutes ago, Redbeard said: Of course ASHP does not do domestic HW Think you mean an Air to Air Heat Pump. I am not sire of the practicalities of fitting a bog standard A2AHP into a ducted forced air system. An old girlfriend of mine had ducted forced air and where the furnace was was quite a large cupboard. Much of it will be down to sound transmission and how well ducts are insulated if they go though a cold area i.e. loft. https://www.ebay.co.uk/itm/115537790345 Edited February 27 by SteamyTea Link to comment Share on other sites More sharing options...
Redbeard Posted February 27 Share Posted February 27 8 minutes ago, SteamyTea said: Think you mean an Air to Air Heat Pump. Indeed I did! Thanks ST. Link to comment Share on other sites More sharing options...
saveasteading Posted February 27 Share Posted February 27 31 minutes ago, SteamyTea said: I am not sire of the practicalities of fitting a bog standard A2AHP into a ducted forced air system. I am. It is perfectly doable but needs some research, and a fitter that is prepared to contemplate it. Most just do what they do. I had air to air, fully ducted and recirculated, put into an office we did for ourselves. It's superb and invisible, but the ducting is complex. It's a USA system and seems tricky to get here any longer. Bottom line though is ASHP takes warm water into the building and through a radiator, and then air passes over the rad and is ducted into the rooms, with a return grille back to the plenum. Very simple technologically. Very difficult to get it done. Link to comment Share on other sites More sharing options...
SteamyTea Posted February 27 Share Posted February 27 4 minutes ago, saveasteading said: It's a USA system and seems tricky to get here any longer. So btu/h, fluid oz, feet, pounds and tons of refrigeration. I have never understood the measuring system in the USA, and then they through in watts, must be done for a laugh. Link to comment Share on other sites More sharing options...
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