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Potential questions to ask installers.

Phil3822 · 2021-05-05T18:09:36Z

Hello all. As a way of me and others learning and also getting to know you all I would be grateful for anyone to mention any questions and areas I should check with installers who will be quoting for an ASHP over the next few months. My 2005 detached home is a 2005 off grid property in rural Lincolnshire. It is EPC C and 173 square meters. Rooms are rather large but not many rooms. There are 3 adults and 2 children living in the home and I work from home. The living room is maintained to 22c and the rest of the house at 20c. Set at 18c during the night all heated by my oil combi boiler. I use approx 1200 litres of oil a year for heating and hot water. We have one bath and 2 mixer showers used daily by all 5 of us. Bath once (baby) and the others shower. My garden is south facing and drive way north facing. I would ideally want the heat pump in the back garden but read it being south facing is not good. My sides are narrow so not possible with the boundary and not fair to neighbours. I have a few worries as my kitchen has a small radiator that does not sufficiently warm the room now. K2 in a bay. I have a local company who have been in the commercial air source heat pump business for years and now in domestic setting. They are MCS registered and he will give me a quote. I will get further quotes using recommendations from here. What else should I consider asking, checking etc. Appreciate any help. Regards, Phil.

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Air Source Heat Pumps (ASHPs)

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Phil3822

(@phil3822)

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Posts: 38

Topic starter 18/05/2021 4:09 pm

@julianc

Thanks Julian. He installs other brands but just listed them as the ones he has best experience with. He said he will review overall needs and has a show room type place we can view and hear some. He would highlight other customers installations to for viewing. I also thought 300L was large, he highlighted my 3 girl household plus of course us boys. 5 of us. I did not ask if his quote should include indicative RHI repayments to help me with timing for the job. I agree about further questions once quote comes through for sure.

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JulianC

(@julianc)

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Posts: 336

18/05/2021 4:29 pm

He should help with RHI if he is MCS approved.
Best wishes with the investigating

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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Bea1060

(@bea1060)

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Posts: 15

18/05/2021 5:13 pm

@phil38 hi I have just had a 260 litre installed along side my air source heat pump as there are 5 of us in the household so I would say seems about right

kind regards Bea

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Morgan

(@morgan)

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Posts: 698

09/07/2021 2:21 pm

We have pushed the go button on an ASHP installation and now awaiting appointment for the full technical/design survey having accepted the quote and paid the initial deposit. Some questions. My quote includes a Megaflow tank and it’s previously been suggested I ask the installer re the possibility of a Mixergy instead which I intend to do. With that in mind I’m considering other aspects and some advice and recommendations will be appreciated please.

1. Initially opted for a complete single zone. Now thinking I might like the bathroom radiator to be separate in order that it can ‘call’ for heat independently of the master control situated in the entrance hall. Thoughts?

2. Thoughts on the make/type of controller in the hall. In my previous house with gas CH I had Hive so something along that route will be advantageous.

3. TRV’s. I want more control than simply a number on a dial so with that in mind advice and recommendations re TRV’s that can be set at a temp per rad as opposed to just a hit or miss number.

I’m bound to have forgotten loads so may be adding questions but your thoughts and recommendations from experience will be very welcome.

TIA Morgan.

Retrofitted 11.2kw Mitsubishi Ecodan to new radiators commissioned November 2021.
14 x 500w Monocrystalline solar panels.

2 ESS Smile G3 10.1 batteries.
ESS Smile G3 5kw inverter.

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Kev M

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11/07/2021 6:41 am

@morgan, I can't answer your questions with any authority so I won't try! I think your questions would be valid for any CH, not just an ASHP system.

We have 2 zones with standard dial TRVs and it works for us. Our bedroom zone is always set to lower temperature but I think you could achieve a similar effect with one zone and TRVs. Both our controllers are portable so we can move them around if we want; in practice we don't.

Good luck with the installation.

Kev

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Mars

(@editor)

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Joined: 5 years ago

Posts: 4550

12/07/2021 10:26 am

@Morgan, your idea to have a separate call for heat in the bathroom is a good idea - not so helpful in the winter, but great in the summer. Our ASHP has been off this summer, so our towel rail does not come on at all. This was never an option for us because of the plumbing we inherited, but worth looking into if you have the choice.

As for controllers, we've never used Hive. We have a heat miser solution that works very well for our UFH.

TRVs – we use Eve Thermo TRVs. Cannot speak highly enough of them. But you do need an iPhone as they're HomeKit enabled only. They have a Thread version coming out this summer. Controllers for heat pumps can be tricky, and we covered this topic in this video, relating specifically to out house:

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Morgan

(@morgan)

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12/07/2021 2:48 pm

@editor

I like the idea of the Hive system because each rad fitted with a Hive TRV can ‘call’ for heat and fire up the pump. They don’t however get exactly rave reviews on Amazon. Something similar however that can independently call for heat rather than rely solely on the controller, normally placed in the entrance hall, being cold enough to start the process and allow the other rooms to warm up.

Retrofitted 11.2kw Mitsubishi Ecodan to new radiators commissioned November 2021.
14 x 500w Monocrystalline solar panels.

2 ESS Smile G3 10.1 batteries.
ESS Smile G3 5kw inverter.

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Derek M

(@derek-m)

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Posts: 4425

12/07/2021 4:35 pm

Hi Morgan,

It may be useful for you to watch the following video which details the Drayton Wiser system.

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Morgan

(@morgan)

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12/07/2021 5:32 pm

@derek-m

Very interesting. I will have to ask my installer if he’d be okay doing this. Thanks Derek.

Retrofitted 11.2kw Mitsubishi Ecodan to new radiators commissioned November 2021.
14 x 500w Monocrystalline solar panels.

2 ESS Smile G3 10.1 batteries.
ESS Smile G3 5kw inverter.

👍

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Mars

(@editor)

Illustrious Member Admin

Joined: 5 years ago

Posts: 4550

18/07/2021 4:17 pm

@Morgan, fair enough. Tado have a similar system to Hive then. We were going to install Tado across our property but when I called them to get pre-sales support they were extremely rude and unhelpful, so I didn't want to support them. Maybe they've gotten better now. But that may be an alternative to Hive.

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Subscribe and follow our YouTube channel!

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