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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 27, 2025
Profile Activity
Topics: 17 / Replies: 2706
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@heatgeek @uk_pete_2000 I think it's clear that the general conclusions that apply to the vast majority of UK housing stock, may not apply to the t...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona3 with Octopus Cosy tariff

This is simple. Heat pumps and boilers can only supply water at one flow temperature at any one time. You need a higher ft for the dhw than you nee...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona3 with Octopus Cosy tariff

It's actually quite a revelation to see how Vaillant and ideal have designed the UI to WC. I suspect this because they have 20 plus years of experien...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona3 with Octopus Cosy tariff

Is it cycling or defrost. More likely the latter at current overnight temperature

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

Mitsubishi iLife 2 slim./p>

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona3 with Octopus Cosy tariff

Sitck with it, if you get your WC curve down to the lowest possible consistent with heating the house you should have an efficient system and plenty o...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

Just to say you do need a firm tap (occasionally several), just opposite the inlet to the radiator. Hit it about as hard as you dare. Sometimes this...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

So deltaT across rad circuit = 37.9-24.4 = 13.5C. ~5C is what we are looking for. So Im expecting the return from rads to be more like 32C than 24...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Is My Midea Heat Pump Inherently Defective?

Yes. If the pin feels sprung then no problem. If it moves freely then the closing piece (not sure what it's called) may be stuck. A few sharp taps ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Not a good January? My heat pump used 840 KWh of electricity

You adjust the end points of the sloped line.you presented earlier. This will be somewhere in the menu, probably the installer menu. I would reduce ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Not a good January? My heat pump used 840 KWh of electricity

Yes thanks, good plot Yes initially, but then you turn down the weather compensation curve until the house is at just the right temperature, that...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Not a good January? My heat pump used 840 KWh of electricity

Situation normal then as @tim441 says you are almost certainly going to have to meddle if you want your system to work efficiently. T...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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