Heat Exchanger with AGA and heat pump

[Ian McGuire]

Hi All I have a client asking whether they can still use the AGA to heat rads once the air source heat pump is in. I think it is possible using a heat exchanger so the low pressure AGA and high pressure heat pump systems don't connect. I've seen it done on biomass systems but wonder what the implications are with heat pump legislation

 

[ShaunCorbs]

No as you should be designing the heat pump system for dt 21 eg 45 flow so the aga is running two hot