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ASHP for UFH


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Depends .....

 

If you get a decent ASHP with full inverter driven compressor and modulation down to a low level then you can go direct from ASHP to manifold. The issue becomes when you need something with a peak load higher than a small unit (ie need a 8/12kw unit due to higher heat requirement) that the modulation doesn’t go low enough and when the zones start shutting off and you reach within 2-3c of the blending point you may get short cycling. You can go for pure fixed flow temp from the ASHP and lose the blending sets etc entirely but this needs a decent controller that allows you to set up temperature curves. 

 

Second option is to use a small 60 litre or so buffer tank and let this smooth out the modulation and short cycling issues. 

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Just bear in mind that you also need to run antifreeze in the whole system if it’s direct connect - dosing and filling is one issue if it’s direct, but a buffer increases the volume and subsequent antifreeze need and cost. 

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