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Last seen: Aug 16, 2026
Hi @notanexpert Welcome to the forum. I can understand your anxiety about moving away from what you know and the possibility of a bodged install....
@morganr I agree the table is quite confusing. I'm not sure if it is intended to cover a range of heat pumps rather than just one model. The first ...
@morganr Well you have certainly done due diligence 😁. I think its likely that your 4kw estimate is about right but a 6kw model shouldn't be g...
@morganr my understanding of the HG table is that it indicates how much heat can be delivered through that pipe size at a flow 0.9 mps. This is the st...
@morganr Hi. Welcome to the forum. I've used 15mm plastic to all my radiators and have calculated the correct power rates based on actual internal d...
So assuming 45p per liter and 7 kWh per liter thats about 19,000 kWh per year for heating. Does that match with your EPC, it should state it as mine d...
@rocky-a Hi Rocky. Welcome to the forum. Just to clarify, any house can be heated with a heat pump, despite some of the stories you might hear that...
@pooneil thanks for the feedback. Good to know it worked out in the end and Homely functions well.
@jamespa That was my feeling, but I have seen it argued that oversizing does not cause significant inefficiency, so I erred on the diplomatic side 🙂
@johnnyb I believe the jury is hung as to whether an oversized heat pump is actually less efficient. I think most people though agree excessive cyclin...
@johnnyb Using the immersion wont improve the efficiency but if you can get cheap rate electricity it should be no more expensive and may even be chea...
@jamespa That's interesting James. Two other things occurred to me after my last post.The first is that all DHW cylinders include an immersion heater ...
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Degrees of Separation
Latest Posts
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RE: How Accurate Is My DIY Heat Loss Calculation?
@editor Thanks Mars, I have been enjoying playing with ...
By kilgorexv , 3 hours ago
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New Vaillant Arotherm controls link to existing thermostats ; wired vs wireless
I am feeling baffled and worried:We are having a an Aro...
By GutoFfowc , 6 hours 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 , 9 hours ago
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@Mars Good questions! The downstairs unit did the maj...
By Rob of York , 9 hours ago
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RE: Questions about A2A for heating as well as cooling
@donciccio I would suggest that you take a "fabric-fi...
By Rob of York , 9 hours 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 , 1 day 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 , 2 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 , 2 days 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 , 2 days ago
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@tomtheheatingengineer, thank you, and welcome to the f...
By Mars , 3 days ago
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RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
@majordennisbloodnok @tomtheheatingengineer For my ...
By JamesPa , 3 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 , 3 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 , 6 days ago
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