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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 12, 2025
Profile Activity
Topics: 17 / Replies: 2832
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RE: Baffled by heat pump size/ choice!

OK lets go with 6, 8 minute showers at 10l/min. So you need 480l of water at 40C. If you start of with 300l at 48C (a common setting) and mix it wit...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Baffled by heat pump size/ choice!

Any heating set up with either variable or low flow temperature does this. In the UK we normally set up boilers to run at a high fixed flow temperatu...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Baffled by heat pump size/ choice!

We need to do some energy calculations! Over what period do you need 8 showers and do you know the water flow rate even roughly. We need these numbe...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 6 Red Flags to Avoid When Considering a Heat Pump Installation

The ASHP, just like a boiler, can supply water at only one temperature at any time. So it switches between space heating and DHW. There will be one ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 6 Red Flags to Avoid When Considering a Heat Pump Installation

@mars That could be a whole discussion in itself. I don't personally think its simple!

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: New Samsung 12KW Heat Pump Help

Unless you have a time of use tarriff/economy 7 then the most economical way to heat DHW is when its warmest outside, generally mid afternoon. Howeve...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan help - flow temperature spikes when operating in weather compensation mode

It can do provided that doing so doesn't exceed the maximum possible output power. That's the basic limitation which it can't circumvent. Your 8.5kW...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat loss with gas usage.

In general terms most heat pumps have this kind of characteristic unless output is capped in the firmware to flatten the curve artificially. Do ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Thermostat setting...still learning

at 8.5p per kWh its probably not worth spending too much time optimising for efficiency unless you want to enter into the top of the SCOPs competition...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: New Samsung 12KW Heat Pump Help

Welcome. Firstly looking at individual days is essentially useless, houses have a 'memory' so you can really only make meaningful 'measurements' seve...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Thermostat setting...still learning

Yes, the minimum cost will (almost certainly) come if you get the WC adjusted so it just heats the house to temperature so the lower you can get it wh...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Should We Rethink the Name “Heat Pump” for Homeowners?

just cale (cally) I would think. I dont dislike it! I just checked German, French and Spanish, all are a direct translation of heat pump - or o...

10 months ago
Forum
Well & Truly Off The Grid
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