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Last seen: Jul 9, 2026
@sentinam Yes. Parameter '21 04'; the temperature at which the HP will be aiming at the high LWT value set in parameter '21 02'. By 'High LWT' I meant...
@mab I think most have changed their low end to 0 from -4, I have. I guess once you're at zero, you'll need 'high LWT'. I'm getting the figures from...
Hopefully things have improved now the cold snap has reached its end ... ? There are many (too many) parameters to consider to improve performance, ...
@mab As it's been seconds since any graphs were posted, here are two interesting ones from over the weekend, both showing a couple of defrost periods....
@marvinator80 Who are you getting to service? Do you have a local engineer, or are you going to Grant via their "annual service plan"?
@jamespa This is what Grant recommend (insist?) on. There's no "if you fancy it" it's "this is how we want it done" for all Grant installs. Grant do...
@marvinator80 No, these are parameters beginning '46' (see the linked document in my first post). Your LLH needs to have the immersion heater element ...
@jamespa Grant describe it as a "combined low loss header and volumiser". This bit of kit comes with all standard Grant installs, and has the flow/ret...
@mab My defrost cycles are still on-going, and have been for the last 66 hours solidly, apart from that hour when the HW heating happens, when LWT sho...
@roamingbull Until yesterday evening they were what I got from the installer (WC was off, so I'm surprised these differ from the default values): 21...
I'm in a village in Cumbria, on the edge of the Lake District. Yesterday was one of those still days, with freezing fog hanging low to the ground; tod...
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Degrees of Separation
Latest Posts
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RE: Volumisers in Heat Pump Systems: Does Placement Matter?
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@kilgorexv, I actually think doing your own calculation...
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My thought is simple. Bring it on and bring on plug in...
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RE: Heat Geek mini store vs pump size
Yes I agree, that’s why Heat Geek have most likely sele...
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RE: Who's your electricity provider and what's your tariff?
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@tomtheheatingengineer, thank you, and welcome to the f...
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RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
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RE: Do I add Air Con or MVHR to existing A2W ASHP?
There is scope for product development here. I for one...
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RE: Is the "divide by 2900" rule still valid?
Really flow rate is a pipework limitation not a water p...
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RE: The good, the bad and the not that great – my heat pump installation
@burtis, I’ve followed this thread pretty much from the...
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RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
First time poster here but I can share my experience as...
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RE: Is it the house or the equipment?
...which, I've found out, is pretty much impossible to ...
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