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How to use a WaterHeater:HeatPump in OS ?

I have spent a lot of time trying to use the WaterHeater:HeatPump in OS but I always have a problem with heat loads. First I used a standard boiler (which works perfectly) and then I followed @Kyle Benne instructions to use this component instead.

However, this post (see @Archmage's answer) shows there are significant differences between the two systems. My problem is similar but I can't figure exactly what I have to add and where. I tried to add at least a HeatExchanger:FluidToFluid but It caused node problems... I think I need some help to understand this component before doing more tests.

How to use a WaterHeater:HeatPump in OS ?

I have spent a lot of time trying to use the WaterHeater:HeatPump in OS but I always have a problem with heat loads. First I used a standard boiler (which works perfectly) and then I followed @Kyle Benne instructions to use this component instead.

However, this post (see @Archmage's answer) shows there are significant differences between the two systems. My problem is similar but I can't figure exactly what I have to add and where. I tried to add at least a HeatExchanger:FluidToFluid but It caused node problems... I think I need some help to understand this component before doing more tests.