Quote:
Originally Posted by AC_Hacker
The refrigerant-to-water HX was not so big coiled tube-in-tube.
I looked at the published COP figures and decided that I could make it descent if I got a much larger (Height x Width) evaporator HX with less rows, and created a crank case heater, and replaced the HX with brazed plate, and changed the refrigerant, and on, and on...
Just too much work.
I gave it away.
-AC
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You're assessment of these little heat pump water heaters got me thinking about the tube in tube condenser being undersized.
So I tried turning the circulation pump up to full speed, consumption of the pump rose by around 20w, output of the heat pump rose by 400w when heating the floor and by 900w when heating the hot water tank.
This is a huge improvement with cop now nudging 3 at times although I have a feeling I may have issues with the evaporator icing due to the extra heat demand.
Steve