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Grant 10kW versus Samsung 12kW - sizing dilemma with ECO4 installation

TobyG · 2024-02-07T21:43:27Z

Hello, we’re about to receive an ECO4 funded package of works which includes a heat pump and resized radiators and pipework (as well as internal wall insulation and some solar PV) – which we’re really glad for. To cut a long story short, we now need to choose between a Samsung 12kW heat pump and a Grant 10kW Aerona – I’m wondering if anyone can give us some advice with this? I’ve had some input from Samsung 12kW users so particularly trying to find out about the Grant 10kW in comparison. Some background as follows: The house, in Gloucestershire, is approx 150 m2, with solid stone walls; extensions all around the ground floor with cavity wall insulation, internal wall insulation will be installed on the upper floors as part of the ECO4 package. The installers have provided calculations which give heat loss as approx 16,000 kWh/yr, which with 4000kWh for hot water gives a total heat demand of 20,000 kWh/yr. Their figure for heat pump ‘capacity @ design conditions’ (-1.7c) is 10.5kW, and based on this they proposed the Samsung 12kW Gen 6. Our energy use (gas) for the last 12 months is just over 10,000 kWh/yr, and by monitoring our usage during the week of temperatures around zero last month, we came to a heat loss figure of 3.2kW in cold conditions – so on both these measures, substantially different to the installer’s. We’ve had really useful input on another thread on this forum, helping with these calculations, and suggesting that the Samsung 12kw could turn out to be oversized. We've raised this with the installers, and they stand by their calculations, which I understand follow ECO4 requirements. But they have said that if we're still worried, as an alternative they would be able to provide a Grant 10kW Aerona, providing we sign a disclaimer in case it's not quite powerful enough in very cold weather. For what it's worth I think the people we're dealing with are conscientious and are trying to be helpful within the parameters. So that's what we need to decide - Grant 10kW or Samsung 12kW! I've started looking up the Grant, including on this forum; if anyone here has an opinion I'd be very grateful for it. I'm wondering if apart from the power difference there are other pros or cons with the Grant, or things to be aware of between these two makes / models? Also, considering if dropping from 12kW to 10kW is a big enough change (with regard to oversizing, efficiency, cycling, modulating down, etc) to make it worth putting ourselves in the position of having not gone with the installers' recommendation. Thanks in advance.

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Air Source Heat Pumps (ASHPs)

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TobyG

(@tobyg)

Eminent Member Member

Joined: 3 years ago

Posts: 32

Topic starter 20/09/2024 7:30 pm

Balancing all the advice here we decided on the Grant 10Kw over the Samsung 16kw.

The installation was at the start of March. We were very impressed. A team from the Valleys hit the house like a (well-oiled) train and it was all done in two days, they took on board some requests (e.g. about fixings) and really knew what they were doing. We’ve had a few trades in the house since, including a plumber, who have praised the configuration and pipework. Given that this was grant funded and so we had no control over that side of things I feel we’ve been very fortunate.

The system has performed fine so far but obviously we haven’t been in the winter months. I’ll try to remember to give another update come December. The one issue has been the new Grant smart controller – there were significant teething problems. The installers, and Grant engineers, were learning the product themselves on the job, but on the plus side that has meant that we’ve had their attention, and so far the customer service has been very good. It’s working fine now, but again, we’ll see how it goes through its first winter.

👍

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