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Johnmo
@johnmo
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Prominent Member
Joined: Jan 25, 2023
Last seen: Mar 11, 2025
Profile Activity
Topics: 2 / Replies: 422
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RE: Mitsubishi PUHZ-SW120 ASHP & Buffer Tank

Comparing your heat pump, circulation pump and the secondary pump curves they are very similar. So assuming the heat pump isn't 10s of metres away the...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat loss calculations and how they work in conjunction with heat pump sizing

I have zero issue with a heat pump being oversized. Actual house loss at -3 is 3kW and our installed heat pump at -3 is 6kW. So able to deliver double...

7 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
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RE: Mitsubishi PUHZ-SW120 ASHP & Buffer Tank

First to make the buffer to a volumiser, you need to compare the secondary to pump capacity and head curve. This should be easy enough for the plumber...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump domestic hot water.

@david999 £2 per day just for DHW? If so, you really need to sort out your settings. It should be well under half that amount on a standard tariff. On...

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

So you have a very different system. You have a thermal store, so the heat pump only produces a single flow temperature. Based on being 2009 install y...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump domestic hot water.

Possibly why you use so much electric, likely the heat pump is starting the immersion as it's not capable of getting there on its own. Turn the demand...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump domestic hot water.

Seen similar mentioned for big Vaillant units. I would consider doing a comparison trial just heating with the immersion and compare. Also double chec...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump domestic hot water.

@david999 you need to include some specifics, your figure could heat up a thimble or a lake, pretty meaningless really. That is a heating power, b...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump domestic hot water.

210L 2 heats to 50 degs today, total used 2.6kW. if it heats once 1.4kW

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Sunamp Thermino Heat Battery

Several different views on Buildhub. @TerryE on Buildhub has just replaced 2 units with an unvented cylinder due to reliability issues. Do your due d...

7 months ago
Forum
Domestic Hot Water & Cylinders
Reply
RE: Additional £250 off the price from Octopus

Not sure I would encourage, anyone to get a heat pump designed to run at 50 degs. Without knowing they will need to fit bigger radiators than those th...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: EV charger working with TOU tariff, solar PV and ASHP

Certainly for battery charging against forecast, all systems need a little fine tuning to get them reliably forecasting and charging. I ditched home a...

7 months ago
Forum
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