Jeff Dee

Any news about which Heat Pump (Water/Air) manufacturer can supply an ASHP unit that can be used with a Johnson & Starley warm air unit. Presently J&S are not making any ASHP. From Johnson and Starley: Johnson & Starley does not currently manufacture heat pumps, as there are already a wide range of ASHP manufacturers and systems available on the market. However, the J&S Aquair can be incorporated into an ASHP installation. Due to the lower flow rates typically associated with heat pump systems, the Aquair would generally need to be sized larger than would be required for a conventional heating system. Based on an existing warm-air heater, a J32, we would anticipate that an Aquair S-20 might be suitable. However, the final specification should be determined by the ASHP installer following a heat-loss calculation for the property, to ensure that the correct output is selected. Interesting to hear that, in principle, it should work providing you get the correctly rated ASHP and a slightly higher rated Aquair S warm air model - depending on your layout. Mine has very little ducting, in fact the Aquair would sit straight on the existing plenum (duct), although I suspect that some adjustment will be necessary. Also it looks like you also need to factor in extra kit like water reservoir holding tanks, to and from the ASHP. However how big they are and where they need to be installed still needs to be confirmed... Anyone else got any further yet ...