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Last seen: Aug 1, 2026
I am drawing the same conclusion that this system for some reason switches off for 3 minutes then 8 minutes latter does it's de-ice cycle. It does th...
8 room thermostats are all in Frost Protection mode. The one in the family room controls the heating. All the manifold actuators have been removed. ...
Your calculation of 13W per sqm fits well with what I found at 14W. So if I require 14W/m2 and the floor area is 179m. 179x14 = 2505. Does that m...
From the Full SAP Report: Space heating requirements: 8314 Kwh/year I can see the U values for all of the structure, but don’t understand the fina...
I done some checking with chatgpt and yes its 7 KW output with an input of approx 2KW, thank you for correcting this. So at 20W/m2 and 200sq/m that'...
Is that 7KW input or output. If 7KW input that's way oversized. I have attached an image of the name plate on the heat pump, for confirmation. I ha...
Thank you for the clarification on how the de-ice cycle works. Regarding the question on flow rates across the heat exchanger. I have this split sy...
I have been making some adjustments to the heating and would like to clarify a point. If you are having short cycling issues, is it best to slow the...
@jamespa Thank you for the reply. That clarifies things. I hadn't read the starters guide, but will do now. It's a 2 port buffer. When zero or b...
Thank you, that helped in my understanding. I believe this Hitachi split system takes water from the buffer tank/underfloor to defrost the evaporator...
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Degrees of Separation
Latest Posts
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RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
Hi, sorry that I have been absent for a while. I'd like...
By baroquebank , 2 hours ago
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RE: To re-pipe or not to re-pipe? Moving from oil boiler to air source heat pump.
@penval, really useful update. After all the discussion...
By Mars , 6 hours ago
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RE: Who's your electricity provider and what's your tariff?
@papahuhu I prefer to look at it simplistically. We d...
By Old_Scientist , 1 day ago
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RE: How Accurate Is My DIY Heat Loss Calculation?
D'oh - of course. I shouldn't post before my brain is f...
By Old_Scientist , 1 day ago
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RE: Questions about A2A for heating as well as cooling
@rob-of-york I would concur with the underfloor insulat...
By Toodles , 1 day ago
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RE: New Vaillant Arotherm controls link to existing thermostats ; wired vs wireless
Nothing attached! I have rads but UFH makes the case ...
By JamesPa , 1 day ago
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RE: Cooling with air to water heat pumps
Passive cooling should always be the first call. Keep ...
By JamesPa , 1 day ago
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RE: Do I add Air Con or MVHR to existing A2W ASHP?
@rob-of-york Thank you, I’m thinking along these same l...
By Toodles , 2 days ago
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@Mars Good questions! The downstairs unit did the maj...
By Rob of York , 2 days ago
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RE: Volumisers in Heat Pump Systems: Does Placement Matter?
@dave, I think @jamespa has probably identified the mos...
By Mars , 3 days 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 , 4 days 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 , 4 days ago
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@tomtheheatingengineer, thank you, and welcome to the f...
By Mars , 4 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 , 5 days ago
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