Vaillant maximum output capacity testing

[Timbones (Tim)]

There was a similar topic on this subject from last winter that might be interesting:

ASHP sizing for Freezing Conditions

I think this issue is common to alI Air Source makes so would value input from anyone with experience and understanding of what happens with heat pumps in Freezing Conditions and if there is any way to set them to minimize the problem. I don’t think it matters too much - for this issue, whether your emitters are radiators or underfloor, mine is a mix of radiators and convector rads. I have enough emitter capacity to run it at 38c and get the required output at -2c outside. I’ll start by with m…

Trystan’s ram his own tests too:

5kW R410a Ecodan PUHZ-W50VHA2(-BS) maximum output testing

Im interested in getting a better grasp of how well the monitored maximum output of different heat pumps match their datasheet rated outputs at various outside conditions. In particular heavy defrost conditions. I want to know how much margin is a good idea to build into the sizing assumptions to account for loss of capacity during heavy defrost conditions and will be watching the thread here ASHP sizing for Freezing Conditions with interest. I will post in this thread the results of various t…