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Samsung 5kW R32 Monobloc Gen 6 ASHP

Air Source Heat Pumps (ASHPs)

Last Post by Old_Scientist 1 week ago

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bontwoody

(@bontwoody)

Noble Member Contributor

Joined: 4 years ago

Posts: 887

Topic starter 16/01/2024 6:12 pm

In August 2022, we moved into our new two-bedroom house in Pembrokeshire. The bungalow, originally built sometime in the 1800s, was of solid stone construction. It had been extended in the 1970s with a new kitchen and front room featuring double breeze block construction with loose-fill insulation. The EPC was an optimistic C, but it did have 2.66 kW of solar panels on the highest FIT tariff.

I had installed a 5 kW Mitsubishi Ecodan ASHP in my previous house, a self-build from 2012, and wanted to use a heat pump again in this one. This property currently had a quite nice, newish gas combi boiler, but I knew I could reuse it in a rental property I owned.

I had been happy with the Mitsubishi and considered purchasing one again, but was tempted by the cheaper, newer, higher-temperature Samsung Gen 6, which I had heard good things about and seen that the controller was easier to set up. It also had some interesting communication options via Modbus.

I considered applying for the government grant, but for various reasons, decided to install it myself. It would be cheaper that way, and I was confident that I could do a better job than many of the installs I saw complaints about.

In preparation for the heat pump, I beefed up my loft insulation and ran my gas boiler at a low temperature to see where I needed radiator upgrades. I was able to shuffle radiators about to smaller bedrooms, purchasing only two very large radiators for the living areas. I also fitted a Mixergy hot water cylinder and MyEnergi Eddi solar diverter to enable us to have hot water once the gas combi was removed.

In February 2023, I bit the bullet and ordered my Samsung 5kw R32 Monobloc Gen 6 heat pump from The Heat Pump Warehouse. It arrived as promised, and I set about installing it with the help of some YouTube videos. In my previous house, I was frustrated that I could not monitor how my heat pump was performing, so I decided to stump up for an OpenEnergyMonitor system that would do the job.

Installation went relatively smoothly until it was time to switch it on. At this point, an error code popped up. After much frustration and fault-finding on a Sunday, I found the problem. The fan hadn't been plugged into the main circuit board. Needless to say, I was a bit miffed about this and later discovered that the heat pump had, in fact, been supplied by Joule, who denied all responsibility for the fault and even went so far as to accuse me of sabotaging it myself.

I encountered some other issues along the way, and these are described fully in my blog, The Greening of Rose Cottage, for those interested. The Samsung controller was used as the only thermostat for the system.

Once the heat pump was up and running, I set about adjusting the weather compensation settings to give us the appropriate heating temperature. We prefer 22C in the living rooms and cooler in the bedrooms. All thermostatic radiator valves were opened to their maximum, and the manual radiator valves were used to adjust flow. Further adjustments were made as the outside temperatures got colder later in the year. We tend only to heat the house during daytime hours.

The heat pump performed well, with heating SCOPs between 4.65 in September to 3.97 in December. After purchasing an electric vehicle and moving to the Intelligent Octopus tariff, I made the decision just to heat the water cylinder via the immersion heater at night for 7.5p/kWh and not to purchase a heat exchanger to enable it to be heated via the heat pump.

To complement the heat pump, I had an additional 4.65 kW of solar panels fitted, along with a 5kWh battery. This helps keep the electricity costs down greatly, and so far, bills have been lower than they would have been had we still been using gas. I expect to see a significant income from export in the summer months to help offset the costs of the improvements.

House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60

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Mars

(@editor)

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Joined: 5 years ago

Posts: 3549

16/01/2024 9:17 pm

I'm super impressed with your initiative to self-install your system, and shocked in equal measure by Joule's sabotage accusation. That's really crazy. But kudos to you for seeing it through and getting it up and running.

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west

(@west)

Eminent Member Member

Joined: 2 years ago

Posts: 14

17/01/2024 10:20 am

Well done, impressed wish i could have done my own, spent years with the loans/grants fiasco never got a penny. I used an MCS, RECC, approved company, in 2014 still solving issues, had another Napit Inspector this month!!

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Simon Austin

(@Simon Austin)

Joined: 2 years ago

Posts: 1

19/01/2024 8:09 am

Did you do anything to insulate the solid stone walls? BTW I love Pembrokeshire!

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bontwoody

(@bontwoody)

Joined: 2 years ago

Posts: 12

Topic starter 20/01/2024 9:20 pm

As was I Mars. TBH the whole telephone conversation was bizarre, I was expecting at least an apology but got a full scale nuclear attack!

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bontwoody

(@bontwoody)

Joined: 2 years ago

Posts: 12

Topic starter 20/01/2024 9:21 pm

Its a leap of faith really with a good dose of youtube videos

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bontwoody

(@bontwoody)

Joined: 2 years ago

Posts: 12

Topic starter 20/01/2024 9:24 pm

I have used a thin layer of an insulating lime render on one bedroom wall, more for damp control really and it is expensive. I aim to frame and insulate another wall with insulated plasterboards.

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Nick Owens

(@Nick Owens)

Joined: 8 months ago

Posts: 1

08/02/2025 1:39 pm

I'm curious how your measured SCOP compares to the "generated" and "consumed" energy totals reported by the Samsung itself? I have an oversized Gen6 Samsung 8.5kW in a super-insulated house (peak heat demand 3.3kW, which delivers an average generated / consumed ratio (SCOP?) of 2.75. This includes hot water use with legionella killing switched on. Very frustrating. I know it's crazy to have such a big HP, it came before the insulation before I knew the word "heatgeek", sized on the old EPC, and cycles like crazy! One cheer for the installer.

👍

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bontwoody

(@bontwoody)

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Joined: 4 years ago

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Topic starter 28/09/2025 10:26 am

Sorry for the delayed reply, there was no notification of your question and I just happened across it. The Samsung COP is vastly less than my openenergy monitor COP. For example on the 27th Samsung reported 4.2 whereas OEM reported 5.2. Given the fact I am using a certified heat meter, I am confident it is Samsung that is wrong.

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Old_Scientist

(@old_scientist)

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Joined: 1 year ago

Posts: 287

28/09/2025 11:42 am

Posted by: @bontwoody

↑

Sorry for the delayed reply, there was no notification of your question and I just happened across it. The Samsung COP is vastly less than my openenergy monitor COP. For example on the 27th Samsung reported 4.2 whereas OEM reported 5.2. Given the fact I am using a certified heat meter, I am confident it is Samsung that is wrong.

@bontwoody I don't have a heat meter, but I do have a MID-approved electricity meter measuring the consumption of the heat pump (heat pump only, so excludes MIM controller and pumps), and the Samsung reported figures are more than the MID meter, even allowing for pump usage, measured at 35W each (two pumps, 70W combined). I have to rely on the Samsung figures for generation to calculate (S)COP as that's all I have, but at least I know my electricity usage is low.

Samsung 12kW gen6 ASHP with 50L volumiser and all new large radiators. 7.2kWp solar (south facing), Tesla PW3 (13.5kW)
Solar generation completely offsets ASHP usage annually. We no longer burn ~1600L of kerosene annually.

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Old_Scientist

(@old_scientist)

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Joined: 1 year ago

Posts: 287

28/09/2025 11:51 am

↑

I'm curious how your measured SCOP compares to the "generated" and "consumed" energy totals reported by the Samsung itself? I have an oversized Gen6 Samsung 8.5kW in a super-insulated house (peak heat demand 3.3kW, which delivers an average generated / consumed ratio (SCOP?) of 2.75. This includes hot water use with legionella killing switched on. Very frustrating. I know it's crazy to have such a big HP, it came before the insulation before I knew the word "heatgeek", sized on the old EPC, and cycles like crazy! One cheer for the installer.

Hi @Nick Owens, welcome to the forum.

My Samsung is the 12kW (gen6) model, and last winter my heat loss was just over 4kW on the coldest day... so welcome to the over-sized ASHP club!

I get reasonably good COPs by trying to extend run times using batch heating. You are never going to be able to run continuously low and slow, and the cycling will kill efficiency. I use an external room thermostat (FSV #2091/2) and run in "continuously on" mode (FSV 2093 = 1) to prevent the heat pump cycling, and then just try to extend run times. This does result in significantly more temperature fluctuation but we do achieve good COPs (currently over 5 on a heating run). At the moment we may run the heating for around 30-45mins and then turn off and allow the house to cool by 1-2C before another short batch of heating. We run with a flow temp of 32-33C at the moment, which is the minimum we can achieve in order for our radiators to be able to dissipate the 4kW plus of heat that is the minimum output of my ASHP.

So we can potentially just about achieve continuous running once the outside temp hits 0C, but as soon as the temp rising above freezing, we are cycling or switching off (and we only seek to heat to 20C)

This post was modified 1 week ago 3 times by Old_Scientist

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