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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 10, 2025
Profile Activity
Topics: 17 / Replies: 2822
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RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

OK, so 41.9 in from heat pump, 37.1 out to rads, drop of 5C = 10-15% efficiency penalty. Not sure how the return to the heat pump is higher than the ...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

To the final question yes. If the HP is delivering 43 and through to rads its 37, then you are losing about 12-20% in efficiency as a result of the...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Just one room not reaching desired temperature

If the rads are sized correctly then I would normally say that it could (most probably, but not certainly, is) be an emitter balancing issue. However...

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

OK, the most interesting thing is the temperature drop across the buffer measured between flow from HP and flow to radiators. I dont think I can see ...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: 4 port buffer tank connections

With a very low loss house running at very low flow temperatures its true that the reduction in efficiency from running at the only slightly higher fl...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 4 port buffer tank connections

FWIW my boiler did the same. Sometimes I heard it coming on at 3am in the morning. It heated as well during these forced 'on' periods. But yes, if...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

Yuk (comment on the LLH) In this case surely the secondary must be kept running during defrost, otherwise the only water volume available for defros...

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

Good luck on the modbus. I think you are in with a good chance, these units are based on aircon units used in commercial settings where modbus will l...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Roughly confirming ASHP sizing using existing heat data

... and the value for air changes. Judging by posts on this forum and elsewhere, and comments from a handful of some more independently thinking ins...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 4 port buffer tank connections

Probably not a lot unless you have UFH, although there is a risk of condensation on the pipes When ASHPs are used for cooling one problem that occur...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

That seems reasonable if you have a good sized buffer tank between primary and secondary. but not if you have a plate heat exchanger or low loss heade...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 4 port buffer tank connections

I suspect the experience differs a lot from heat pump to heat pump and house to house. When my 7kW Vaillant (no buffer tank or volumiser) defrosts th...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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