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Replacing Worcester oil boiler with an ASHP

JulianC · 2021-03-30T18:15:26Z

I am replacing my 25/32 Worcester oil boiler with an ASHP Had discussions with many suppliers, a lot of whom wouldn't quote because we have 10mm pipe drops to each radiator, from 28mm loft pipes. Anyway: 201m2 bungalow. Built 2001. EPC rating of B after triple glazing, 300mm of loft insulation. We currently use between 1220-1500L of oil per annum. 100A incoming circuit. ASHP approved by DNO (Western Power). 20,500kWh of heating energy required. 3000kWh of hot water demand from the EPC. An energy loss calc and room by room heat demand has been undertaken. This has lead me to select Ecobubl from Winchester to undertake the work. They have proposed a Daikin Altherma 3H HT 18kW ASHP. Also a Mixergy 150L H/W tank - but we are also considering a standard cylinder with a large internal coil, to maximise the ASHP. And a 3kW immersion to use my 4kW of PV and Solic 200 electric diverter. Simple control system, using my current Nest. Had wondered about the Homely Energy control system, but I wonder if this adds complexity. Price is £13,700 for ASHP + Mixergy + buffer tank + installation and support for RHI. I should get back about £10k through RHI. I will take photos before, during and after installation which should be 12 April

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Air Source Heat Pumps (ASHPs)

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Mars

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21/04/2021 9:29 am

@julianc, that's brilliant. Big day ahead. Hope it all goes according to plan.

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JulianC

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Topic starter 21/04/2021 10:07 am

Thanks Mars. I was joking with Ecobubl, they leave all the doors open, so the home is cold. And you are just grateful for any heat when they switch the ASHP on 😊

Daikin Altherma 3H HT 12kWh ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and Volvo EX30 Ultra Twin Performance electric vehicles with Myenergi Zappi mk1 & Ohme chargers

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JulianC

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Topic starter 21/04/2021 9:19 pm

Mixergy slimline 180L hot water tank installed. But not fully connected. There is an external heat exchange (not shown) for the ASHP. Can also integrate the solar PV. Still requires internet connection. And pipe insulation.

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JulianC

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Topic starter 21/04/2021 9:22 pm

External Daikin Altherma 3H HT installed. But still to be commissioned

Looks good eh? This is an 18kW unit. Single fan

👍

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Kev M

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21/04/2021 9:53 pm

Very nice! Keep the updates coming.

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Mars

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21/04/2021 9:59 pm

@julianc, that is very snazzy. Love the design. Can we get a size pic too when you get a chance?

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JulianC

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Topic starter 21/04/2021 10:38 pm

Daikin Altherma 3H HT is 990mm high by 1270mm wide by 460mm deep or 0.578m3. Below the planning regs 0.6m3 limit. It is also one of the quietest ASHPs on the market with a sound pressure of 38 dBA at 3m. And uses R32 refrigerant - which is better for the environment. I have water only in the circuit between the external unit, internal unit and 27L buffer tank.
More photos to follow as job progresses

👍

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JulianC

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Topic starter 22/04/2021 8:24 pm

And the fan behind the black grill

Quite cool actually

👍

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JulianC

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Topic starter 22/04/2021 8:32 pm

Detail of the internals

We are all wired up. But the Daikin is not recognising the Mixergy tank at the moment. More work to do. And tidying up

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JulianC

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Topic starter 23/04/2021 6:54 pm

Ok, so 95% of work completed

Outdoor unit all working

Indoor unit in the garage (above)

Buffer tank and pump for around the radiators

And finally the Mixergy tank in the airing cupboard Note the insulated heat exchanger at the bottom and the control module at the top Whilst the tank is heating, at the moment it is not from solar PV or the ASHP Mixergy sent the wrong component for the Daikin So my engineer will be back Wednesday to fix Can still schedule and control Mixergy thru the app

So now we just need to learn how to use it Interestingly, the recommendation is to treat it like a boiler and schedule it to come on, rather than on all the time

Time will tell Happy to answer any questions

👍

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Kev M

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23/04/2021 8:35 pm

Looks like a nice job @julianc. We schedule our heating to come on and off using the zone thermostats. This works OK and the house seems to warm up quickly enough.

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Mars

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23/04/2021 9:56 pm

@julianc, it all looks terrific. Hopefully we'll have a few coolish evenings to see how your system copes, and which will help set a baseline for performance. How exciting.

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