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Last seen: Jun 27, 2025
good luck convincing anyone that their radiators will never be warm to the touch... That's why I stick with 38.5 as the hot end of my WC curve - it's ...
@toodles It is purely there to allow the heat pump to operate without any flow errors... Primary side just sits there running into the header, microbo...
@bontwoody indeed, although I would question the viability of having radiators that don't feel warm to the touch, from a homeowner acceptance perspect...
It is my suspicion too, that in milder weather, we are simply oversized. I didn't take into consideration the possibility that the ACH value used in t...
@heacol SCOP only needs to be 2.8 to beat gas - and that's what it's all about... not costing more than a gas boiler.
@jamespa flow temp.... get that accurate first, then tweak the WC curve up/down as required. Think I've got the curve vaguely correct at the moment, s...
@derek-m single heat pump, just run on weather comp, no stats, no setback. The Carel platform that my heat pump is built on allows full tuning of th...
@jamespa I’ve spent ages tweaking the P, I, and D on mine to try and get a decent response without overshoot. It’s not easy, especially when 1. We’re ...
On the subject of control strategy, some units can be set to control on LWT or RWT…. Mine used to be switchable between the two but a recent softwa...
GH has been involved in heat pump installs since the early days, he knows his stuff. He also had to come up with workarounds for flow rate issues that...
I’m sorry I can’t provide anything helpful, but I’m mighty glad I didn’t need a header or buffer in my install. It seems like a nightmare.
@bontwoody scop of 3.2 is certainly achievable, but not very easily on a retrofit unless you design for 45 degree flow, maximum. With octopus (for exa...
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