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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 22, 2025
Profile Activity
Topics: 17 / Replies: 2698
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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
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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)
Reply
RE: Roughly confirming ASHP sizing using existing heat data

As you say you have to make assumptions about boiler efficiency, probably best based on boiler age and whether it actually condenses or not. Cooking...

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

That sounds quite high, but of course I dont know much about your house or how much DHW you use. My total January electricity consumption (minus 1 d...

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

@bobtskutter Thats about how I understand it. To simplify it down, as well as a loss from conduction (to the outside air) and ventilation, the vario...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Smart TRV experiences (ideally integrating with Midea heat pump)

I dont think so. Essentially with TRVs, smart or otherwise, bits of the the system are likely to be shutting down or opening up to control the room t...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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