Add on to flue of boiler.
Alpha used to do it, Ideal did it with ideal logic esp code boilers, Atag do it on there IC economiser combi's which i would like for my own place.
Basically they scavenge most of the remaining latent heat out of the condensate & essentially used that heat to pre-heat the incoming mains cold water to the combi.
Makes sense & improves efficiency.
Also if used in addition to weather comp & load compensation you will have got as efficient a boiler as is currently possible with technology available today.
Examples below -
Vaillant Heat Recovery Device recoFLUE PFGHRD | Ancillaries
WORCESTER Ecoflo Flue Gas Heat Recovery Unit 7733600047 - New inc VAT | eBay
Baxi & Potterton Multifit GasSaver - GS1 720056901
Hope this helps,
Andy
Alpha used to do it, Ideal did it with ideal logic esp code boilers, Atag do it on there IC economiser combi's which i would like for my own place.
Basically they scavenge most of the remaining latent heat out of the condensate & essentially used that heat to pre-heat the incoming mains cold water to the combi.
Makes sense & improves efficiency.
Also if used in addition to weather comp & load compensation you will have got as efficient a boiler as is currently possible with technology available today.
Examples below -
Vaillant Heat Recovery Device recoFLUE PFGHRD | Ancillaries
WORCESTER Ecoflo Flue Gas Heat Recovery Unit 7733600047 - New inc VAT | eBay
Baxi & Potterton Multifit GasSaver - GS1 720056901
Hope this helps,
Andy