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Hitachi Yutaki SCombi Heat Pump - Owners

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Air Source Heat Pumps (ASHPs)

Last Post by JamesPa 7 months ago

27 Posts

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trebor12345

(@trebor12345)

Estimable Member Member

Joined: 2 years ago

Posts: 178

Topic starter 05/04/2025 2:09 pm [#2248]

Does anyone on this forum own a Hitachi Yutaki SCombi Heat Pump? I need to find others and their experience of the system.

I would also be looking for a user specific forum for this pump, I drew a blank. Anyone know of one?

2024 build bungalow, Southern England, 179 m2, 14w/m2
Underfloor heating, fully open
Vaillant aroTHERM plus 3.5kW
50 litre volumiser
3.6KW solar panels

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hitachi Yutaki

Mars

(@editor)

Illustrious Member Admin

Joined: 5 years ago

Posts: 4724

05/04/2025 2:47 pm

@nick and @muscatblue have these units. Not sure if they're still active on these forums (they were last here in 2021), but because they've been tagged they should receive a message, so let's see if they return to help you.

@trebor12345, what was your question?

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trebor12345

(@trebor12345)

Estimable Member Member

Joined: 2 years ago

Posts: 178

Topic starter 05/04/2025 6:37 pm

@editor I just wanted to know other owners thoughts and experience of this system. I am having issues with short cycles and getting steady flow temperature.

2024 build bungalow, Southern England, 179 m2, 14w/m2
Underfloor heating, fully open
Vaillant aroTHERM plus 3.5kW
50 litre volumiser
3.6KW solar panels

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Sim0n0

(@sim0n0)

Active Member Member

Joined: 7 months ago

Posts: 26

26/11/2025 1:50 pm

Posted by: @trebor12345

↑

Does anyone on this forum own a Hitachi Yutaki SCombi Heat Pump? I need to find others and their experience of the system.

I would also be looking for a user specific forum for this pump, I drew a blank. Anyone know of one?

I've got a Hitachi Yutaki 11kW split system. Nothing but trouble and expense over the last 2 1/2 years. Hitachi customer support doesn't exist in the UK. Bosch has recently acquired Hitachi/Johnson Controls for all of Europe, so let's see what happens...

👍

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Mars

(@editor)

Illustrious Member Admin

Joined: 5 years ago

Posts: 4724

26/11/2025 5:10 pm

@sim0n0, increasingly strong anti-Hitachi messaging. Just goes to show how important manufacturer support is. Thanks for sharing.

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trebor12345

(@trebor12345)

Estimable Member Member

Joined: 2 years ago

Posts: 178

Topic starter 26/11/2025 5:22 pm

Posted by: @sim0n0

↑

Posted by: @trebor12345

↑

Does anyone on this forum own a Hitachi Yutaki SCombi Heat Pump? I need to find others and their experience of the system.

I would also be looking for a user specific forum for this pump, I drew a blank. Anyone know of one?

I've got a Hitachi Yutaki 11kW split system. Nothing but trouble and expense over the last 2 1/2 years. Hitachi customer support doesn't exist in the UK. Bosch has recently acquired Hitachi/Johnson Controls for all of Europe, so let's see what happens...

Sim0n0. I also have the Hitachi Yutaki system. Also having lots of problems.

2024 build bungalow, Southern England, 179 m2, 14w/m2
Underfloor heating, fully open
Vaillant aroTHERM plus 3.5kW
50 litre volumiser
3.6KW solar panels

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JamesPa

(@jamespa)

Illustrious Member Moderator

Joined: 3 years ago

Posts: 5107

26/11/2025 5:27 pm

@sim0n0

Sorry to hear that. Putting the past aside would you like to describe the current problems and tell us a bit about your system and house in case we can offer support.

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.

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trebor12345

(@trebor12345)

Estimable Member Member

Joined: 2 years ago

Posts: 178

Topic starter 27/11/2025 5:58 pm

@sim0n0

It would be very useful if you could tell us more about your experience.

2024 build bungalow, Southern England, 179 m2, 14w/m2
Underfloor heating, fully open
Vaillant aroTHERM plus 3.5kW
50 litre volumiser
3.6KW solar panels

👍

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Sim0n0

(@sim0n0)

Active Member Member

Joined: 7 months ago

Posts: 26

29/11/2025 1:13 pm

@jamespa Hi James I appreciate the offer, but what I need is a local heat pump engineer familiar with Hitachi that can offer servicing/support. They don't exist and Hitachi doesn't have UK support. The original installers were useless (now Heat Geak certified), MCS certificate isn't worth the paper it's written on, and Hitachi/Hitachi engineers are non-existent in the UK.

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Sim0n0

(@sim0n0)

Active Member Member

Joined: 7 months ago

Posts: 26

29/11/2025 1:16 pm

@trebor12345 Sorry, the forum won't let me message you until I have more replies

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Sim0n0

(@sim0n0)

Active Member Member

Joined: 7 months ago

Posts: 26

29/11/2025 1:23 pm

@editor So many pro heat pump evangelists on the internet, but the reality, at least local to me in Buckinghamshire, is an industry full of charlatans.

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Sim0n0

(@sim0n0)

Active Member Member

Joined: 7 months ago

Posts: 26

29/11/2025 1:30 pm

@jamespa Latest issue is the system getting 'stuck' in hot water mode and not switching back to heating. The motorised valve can be operated manually.

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