Hitachi Yutaki Heat Pump installation

I had a Air Source Heat Pump installed at the start of December 2011. This page is a summary of the installation details, with some links to specific posts on operating details assuming there is sufficient interest.

2 bed Bungalow, weather station Cambourne. 64m2 floor area, cavity wall insulation, 270mm loft insulation, double glazing. No gas, existing heating was electric storage heaters.

Installed system
Hitachi Yutaki RHUE3-3AVHN1 Heat pump (monoblock Yutaki-M)
180l Gledhill solar/heat pump cylinder (in garage)
6 radiators (2 in lounge)
Hitachi system controller/weather compensation kit.
£8500, plus VAT, less £850 RPP and possible RHI energy credit (tbd)

Performance Spec
(based on MCS calculations)
Building design heat load 5.6 kW
DHW recovery time from cold 40 min
Heating season 30 weeks
Yearly heating use 20000 kWh
Heat pump running cost pa £705
Heat Pump seasonal COP 3.4
Electrical input 5667 kWh
Estimated energy saving =£1200-705=£420 (???)

Current operating parameters
I changed these significantly from the installed values.
P4 0.6 (Compensation curve)
P6 43 (Max Flow – good for -3 centigrade overnight)
P7  5  (room temp compensation)
P10 51 (DHW setpoint)
P11 5 (DHW range)
P12 3 (add to P10 for DHW flow setpoint)

Important for summer operation: EP35=0s. (Set/Sel/’i’ together for engineering parameters)

I changed a few others, but I’m reading from the french version of the instructions, and there is some guesswork involved!

Stats Jan 2012
Energy use 190 kWh (Week 5)
Water heat  340 kWh (COP 1.79)
(Whole house electric consumption 225 kWh)
January whole house 850 kWh

Data logs are here

Real-time monitor stats are here

All posts on the subject of heating can be found here

Comments (11)

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  1. Heat pump running costs – Hitachi Yutaki ASHP | Sean Houlihane says:

    […] the heat pump installation detailed here has been running for 6 months now, and it is probably reasonable to present some comparative data […]

    Posted July 17, 2012 @ 10:53 pm (UK)
  2. VERVERS Charlotte says:

    GOOD AFTERNOON Houlihane family

    congratulations with the installation of a monobloc Hitachi heat pump.
    in Belgium most installation companies are Daikin distributors therefore it’s very difficult to find an
    installation company sofar ….no luck!!
    Courteous greetings,
    Charlotte Ververs

    Posted September 25, 2012 @ 1:17 pm (UK)
  3. 2012 Heat Pump Cost Summary | Sean Houlihane says:

    […] My Hitachi Yutaki heat pump has been running for a year now. Here is a summary of the running cost and comparison with the previous couple of years when all heating was electric storage heaters/fan heaters. First the basic data, costs are approximate, based on last years figures as entered in the imeasure website which I use to track this. […]

    Posted January 26, 2013 @ 4:45 pm (UK)
  4. David says:

    Hi Sean,
    Great blog – I also have a Yutaki 12 Heatpump – I am constantly fiddling with the controller to get it right – I don’t suppose you could post your current controller parameters so I can compare

    All the best


    Posted September 13, 2013 @ 12:23 pm (UK)
  5. Sean says:

    Hi David,

    Something coming soon, but having just started to use heating again this year, I fear I want to change the settings again…

    Posted September 16, 2013 @ 8:55 am (UK)
  6. kai says:

    Hi Sean,

    How do you find the noise from your heat pump? We are looking at a new house which has a Hitachi yutaki fitted. Speaking to the neighbour he said it was quite loud and was running during the night. I don’t fancy upsetting the neighbours before moving in, how’s yours?



    Posted September 25, 2013 @ 9:39 pm (UK)
  7. Sean says:

    Hi, I have mine about 10m from my bedroom window – which is double glazed. I can hear it when it’s running from indoors, but its no louder than anything else with a fan – maybe a little quieter than a PC, and about the same as a cat grooming himself at a distance of about 1 metre.

    Posted September 28, 2013 @ 6:19 pm (UK)
  8. George says:

    Hi Sean very helpful blog -thank you. I have the same heat pump as you in my eco cottage and I too am experimenting with the parameters but I have a different question. Do you know what current your heat pump draws when it is not heating? My Owl monitor on the heat pump shows it pulls between 161W and 300W when the room unit (master control thermostat) is switched off. If I switch off the isolator to the heat pump it drops to zero so something in the heat pump white box is pulling quite a lot of electricity when it is not actually heating my house. I know it has electric heaters for the compressor crankcase oil – but 300W? In our eco cottage we are chasing every watt and so to “waste” 300W outside of my building envelope is a shame. All thoughts and ideas welcome.

    Posted April 17, 2014 @ 8:50 am (UK)
  9. Sean says:

    Hi George,

    I see a constant draw of about 25 W, plus 80W for the circulation pump and 150W for the crank heater. You can see this (I think) on this page
    PumpPower is measured from a domestic meter (dedicated to the heat pump outdoor unit) using the optical pulse. PumpOil is the compressor case temperature. Clearly keeping this at 45 celcius year round is a little excessive. I have a modification which allows me to turn off the outdoor unit (eg when I’m away during the summer) and have it wait a couple of hours to get back to temperature before the DHW kicks in. Further optimisation would be quite easy here, and its a massive fraction of the annual cost to be throwing away.

    Posted April 21, 2014 @ 1:22 pm (UK)
  10. George Davies says:

    Hi Sean many thanks for your helpful reply. So if the oil heaters at 180W , the circulation pump at 80W and the 25W are running the “base load of the Hitachi Heat pump is 255W. I am new to all this, do you know if the oil heaters run all the time or do they cycle to maintain the 45C temperature. I do not use my Hitachi to heat the Domestic Hot Water -only space heating – so in this spring weather the heat pump hardly runs but that “base load” adds up.

    Posted April 21, 2014 @ 4:52 pm (UK)
  11. Sean says:

    The oil heater runs at about 50% duty cycle, unless the pump is running when the compressor seems to go both hot and cold, causing more or less draw from the heater. The circulation pump probably runs more than necessary too, in my case pumping already heater water through the circuit when the heater is cut off. No good ideas for improving this, except maybe some judicious insulation or wiring in a time switch

    Posted April 21, 2014 @ 8:19 pm (UK)

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