G
GMH
I have a holiday cottage in a remote location without mains gas. The lpg hot water / central heating system has a recently installed high efficiency condensing boiler. I don't have space for a large lpg tank so use the 47kg bottles and these are expensive. The cottage is getting through a great deal of pg and gaining access to the property in severe weather is difficult so lpg deliveries aren't guaranteed. As the cottage is let I don't really want paying guests freezing..
The cottage will be well insulated (still needs to be finished) and has double glazing throughout. Unfortunately it has wooden floorboards but these are covered throughout with the aim of minimising drafts. Cavity wall insulation still to be installed but this is planned.
I am looking to possibly install an ASHP as the main source of energy for hot water and central heating. I know I need to oversize the radiators, these need replacing anyway.
I am thinking of using installing an ASHP in such a way as to allow switching between ASHP and lpg boiler. ASHP used mainly, but for the lpg boiler to provide a manual boost (possibly via the Internet as I live 300 miles away) in extreme weather conditions when it is least efficient and when the lower radiator temperature isn't sufficient to heat the house. I don't like to heat the cottage unnecessarily so to keep it ticking along when it isn't let is probably ideal via an ASHP with the thermostat set low.
I am thinking of installing a Daikin Altherma monobloc LT ASHP. One of the new 8kW units should be adequate, although I will seek advice on this - 3 bed semi-detached bungalow. BTW - not enough space for a GSHP and not really enough space for an indoor unit to accompany the ASHP.
I'm not a plumber, but enthusiastic amateur!
Do you know if this approach has been done before?
Do you see any problems with it?
I have a general question about ASHPs. I understand that the COP changes with temperature. If an ASHP is rated at 8kW will it always give 8kW over the temperature range -10 to +25C and just demand more input power, or does the input power remain the same but the output drops?
Another general query - can radiators be fan assisted rather than oversizing them?
The cottage will be well insulated (still needs to be finished) and has double glazing throughout. Unfortunately it has wooden floorboards but these are covered throughout with the aim of minimising drafts. Cavity wall insulation still to be installed but this is planned.
I am looking to possibly install an ASHP as the main source of energy for hot water and central heating. I know I need to oversize the radiators, these need replacing anyway.
I am thinking of using installing an ASHP in such a way as to allow switching between ASHP and lpg boiler. ASHP used mainly, but for the lpg boiler to provide a manual boost (possibly via the Internet as I live 300 miles away) in extreme weather conditions when it is least efficient and when the lower radiator temperature isn't sufficient to heat the house. I don't like to heat the cottage unnecessarily so to keep it ticking along when it isn't let is probably ideal via an ASHP with the thermostat set low.
I am thinking of installing a Daikin Altherma monobloc LT ASHP. One of the new 8kW units should be adequate, although I will seek advice on this - 3 bed semi-detached bungalow. BTW - not enough space for a GSHP and not really enough space for an indoor unit to accompany the ASHP.
I'm not a plumber, but enthusiastic amateur!
Do you know if this approach has been done before?
Do you see any problems with it?
I have a general question about ASHPs. I understand that the COP changes with temperature. If an ASHP is rated at 8kW will it always give 8kW over the temperature range -10 to +25C and just demand more input power, or does the input power remain the same but the output drops?
Another general query - can radiators be fan assisted rather than oversizing them?