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Last seen: Oct 4, 2026
@rob-of-york Great data and analysis. Im personally convinced that, intelligently used, this is a sound way to assess heat loss. FWIW h...
Great. You just need to find a way of cranking up your circulator (if necessary) until either the target flow rate is reached or its too noisy, or pl...
There may be a 'max temp for heating' parameter. Alternatively you could extrapolate the curve to a higher OAT point and set the T4H2 parameters acco...
Could be, but of course that will cause the IAT to rise. There again you might, quite possibly do, open the door/windows to compensate. I set my min...
There arent many of these hitachi pumps around here so you may not get an answer. I had a not dissimilar fault with my Vaillant albeit I did get a (...
No it cant, but it could be a (material) fixed or quasi-fixed consumption by the heat pump, or a variable loss elsewhere in the pipework (eg the PHE) ...
Absolutely agree. When I did my heat loss determination I averaged over a day and found that the fit was better, albeit only marginally, if...
It may make sense but its not as expected, it should be negative. You are plotting delivered energy to the house vs DT and if there is a positive con...
I think trying to deduce flow rate from an instantaneous measurement of deltaT on a system where you dont know the house loss is a stretch to say the ...
That may not be the case, because its not necessarily the case that PWM = 100% means that the flow rate is 1200l/hr as depending on the pump character...
I thought so Whether you have to take them into account or not depends on the thing you are measuring/the calculation you are doing! A simple drawi...
Or where you can fix the pwm% as you can eg with Vaullant and doubtless others I'm now confused. I thought that there was no point in your syst...
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