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	RE: New ASHP system - choices By Derek M, 2 days ago Forum Air Source Heat Pumps (ASHPs)
	In an ideal world a heat pump unit would contain two compressors, a nominal 12kW capacity heat pump having one compressor rated at 8kW and one compressor rated at 4kW. The 8kW compressor providing hea...
	RE: ASHP Advice: High Temperature vs. Low Temperature Heat Pump For Microbore By Derek M, 2 days ago Forum Air Source Heat Pumps (ASHPs)
	@jamespa I fully agree with James that a HT heat pump will probably be no more costly to run than a LT heat pump when operating at the same LWT. If the reason for installing a HT heat pump is because ...
	RE: Installing your own ASHP - DIY By IanMK13, 2 days ago Forum Air Source Heat Pumps (ASHPs)
	@tomasmcguinness Have you been able to perform any sanity check on that figure? I'm thinking of the 'divide annual gas consumption by 2900' rule of thumb, for example. My own heat loss calculation t...
	RE: ASHP Advice: High Temperature vs. Low Temperature Heat Pump For Microbore By JamesPa, 2 days ago Forum Air Source Heat Pumps (ASHPs)
	I don't think that ot is necessarily the case that you buy a HT pump for it's HT capability or that the expectation is to run a HT pump at ht. Manufacturers are tending to move from R410a (lt) to R32...
	RE: ASHP Advice: High Temperature vs. Low Temperature Heat Pump For Microbore By Mars, 2 days ago Forum Air Source Heat Pumps (ASHPs)
	At @jamespa, I understand your perspective on both High Temperature (HT) and Low Temperature (LT) heat pumps operating below 50°C potentially having comparable running costs. HT heat pumps are often i...
	RE: ASHP Advice: High Temperature vs. Low Temperature Heat Pump For Microbore By JamesPa, 2 days ago Forum Air Source Heat Pumps (ASHPs)
	It's questionable whether zoning saves money with a heat pump. The saving in lost energy is quite small, and because you need a higher ft as a result of less emitter area the reduced efficiency can o...
	RE: New ASHP system - choices By HarriUp, 2 days ago Forum Air Source Heat Pumps (ASHPs)
	All heat pumps will hit the point where their minimum output exceeds the heat being taken out by the heating circuit, not oversizing too much means that happens at a higher outside temperature. How th...
	RE: New ASHP system - choices By JamesPa, 2 days ago Forum Air Source Heat Pumps (ASHPs)
	Thats precisely the same conclusion as I have reached. I have challenged MCS on the method they promote. Their response was that they are aware of it's deficiencies but 'we don't currently have an a...
	RE: New ASHP system - choices By MattC, 2 days ago Forum Air Source Heat Pumps (ASHPs)
	@jamespa Thanks. I'd already concluded that the higher estimates are excessive, which is why I'm going with the lower of the three figures that I've received. To my mind, empirical data should alway...
	RE: Fossil Fuel Fired Heating v Heat Pump? By Toodles, 2 days ago Forum Air Source Heat Pumps (ASHPs)
	@bontwoody 😫 ☹️
	RE: Fossil Fuel Fired Heating v Heat Pump? By bontwoody, 2 days ago Forum Air Source Heat Pumps (ASHPs)
	@toodles I could add about the time, I set fire to the new sofa after leaving it too close to the 'new' gas fire! I still dont know how my parents didnt kill me in my youth.
	RE: ASHP Advice: High Temperature vs. Low Temperature Heat Pump For Microbore By TechnoGeek, 2 days ago Forum Air Source Heat Pumps (ASHPs)
	@graeme I was watching the HeatGeeks YouTube video yesterday regarding heat pumps and microbore pipes for my Father-in-Law's potential project. Well worth a watch, bit techie but there are possible al...