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Last seen: Aug 24, 2026
@newhouse87 Yes and no (but mostly no). There is a point where cycling is inevitable because the heat pump simply cant turn down low enough to matc...
For what its worth Vaillant R290 heat pumps (I discovered a few weeks ago) are designed to do the legionella cycle in the heat pump only, and appear (...
If you have a modulating pump and a heat pump that modulates it then yes (and if they have been correctly connected which isn't always the case where ...
@newhouse87 well your WC line is 34 at -5 and 25 at 20, so at 7 you expect 25+9*(11/25) = 29. So 30 is just 1C out which is likely well within the h...
Has it just come out of a dhw cycle, which would be at a much higher ft (and thus may take a while to cool down)?
Unfortunately I didn't resolve it. #value cells include E1-AA1, D14, 16-18,20,23,24,31,32,36... but opening it in Libre office calc seems to have f...
About 50% of the play sheet. I'm guessing they all rely on or derive from one 'problem' cell. I have an old version of Excel (2003) it could be tha...
@newhouse87 OK sounds more reasonable then, you are most likely heating the slab. As @derek-m says there is no 'right' figure, it depends on the hous...
I downloaded your modelling tool but there are lots of '#value' in the playroom. Is there something I need to dial in to start it working?
An average 2kW consumption (if that is what it is) at this time of year is a lot. You should be getting a COP of 4 ish or more, which means that the ...
One vital question I should have asked. Is '2kwh per hour' energy consumed (as measured eg by your electricity meter) or energy delivered (as measure...
1kW=1kWh per hour (kWh = kilowatts times hours, ie 1 kilowatt for 1 hour. Kilowatt hours per hour is thus kilowatts times hours divided by hours, ie ...
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Latest Posts
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RE: Volumisers in Heat Pump Systems: Does Placement Matter?
@dave, I think @jamespa has probably identified the mos...
By Mars , 8 hours ago
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@kilgorexv, I actually think doing your own calculation...
By Mars , 8 hours ago
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RE: Plug and play solar. Thoughts?
My thought is simple. Bring it on and bring on plug in...
By JamesPa , 22 hours ago
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RE: Heat Geek mini store vs pump size
Yes I agree, that’s why Heat Geek have most likely sele...
By Tomtheheatingengineer , 1 day ago
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RE: Who's your electricity provider and what's your tariff?
@chandykris Swings and Roundabouts, you win some…. ...
By Toodles , 1 day ago
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@tomtheheatingengineer, thank you, and welcome to the f...
By Mars , 2 days ago
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RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
@majordennisbloodnok @tomtheheatingengineer For my ...
By JamesPa , 2 days ago
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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...
By JamesPa , 2 days ago
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RE: Is the "divide by 2900" rule still valid?
Really flow rate is a pipework limitation not a water p...
By JamesPa , 2 days ago
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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...
By Mars , 5 days ago
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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...
By SCH , 6 days ago
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RE: Is it the house or the equipment?
...which, I've found out, is pretty much impossible to ...
By Majordennisbloodnok , 6 days ago
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