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Bristol ASHP consideration

alastair · 2021-10-19T14:08:08Z

I'm going to start this thread as somewhere to keep notes about what we are doing in looking for an ASHP.... Area: south of Bristol House build date: 2000 Details: 4 bed brick detached with cavity walls and suspended floor Initial suggestions from suppliers are Daikin 9kW Monobloc and Daikin Altherma 3HT (11kW?)

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Air Source Heat Pumps (ASHPs)

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Derek M

(@derek-m)

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Joined: 5 years ago

Posts: 4427

09/03/2022 7:43 pm

Posted by: @heat-pump-newbie

Very revealing @alastair. Years ago I nearly got stuck behind the bath by squeezing myself round to reach a big hole just as you describe and stuff it with loft insulation. Builders just boxing round the stink pole and giving no thought to heat loss 🙄. I have the same cold draught coming from the boxing in my current bathroom.

Hi Newbie,

Maybe it is time to get stuck underneath the bath again. 😎

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JulianC

(@julianc)

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Joined: 5 years ago

Posts: 332

09/03/2022 10:28 pm

@alastair welcome to the site. Great description. Check out my Worcestershire ASHP folder here as I used Ecobubl to install a Daikin Altherma 3H HT & Mixergy cylinder at my property. And I’m in the Ecobubl YouTube. They did a great job for us.
How are you controlling your Daikin?

Daikin Altherma 3H HT 12kWh ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and new Hyundai Ioniq 5 N electric vehicles with Myenergi Zappi mk1 charger

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alastair

(@alastair)

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Topic starter 11/03/2022 6:14 pm

@julianc Your video with Ecobubl and your posts on these forums helped us decide who to go with and what to get. We are controlling the Daikin using a Salus room thermostat set to 14C overnight, 17C during the day and 19.5C in the evening. The flow temp is set at 45C. It's all working fine for us. We have quite a few SE facing windows, and this morning there was enough sun (before the rain kicked in) and the overnight temperature was warm enough that we had our first day where the heat pump didn't come on first thing (eventually kicked in when the rain was falling).

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alastair

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Topic starter 24/03/2022 12:34 pm

Latest blog post - work has been a bit manic and so I've been slow writing this up:

AJGDEVELOP.WORDPRESS.COM "https://ajgdevelop.wordpress.com/2022/03/24/retrofit-6-first-impressions/"

Retrofit #6: First impressions – AJG-Develop

Everything we needed doing on the retrofit was completed back in January 2022. We've been living with the system for a couple of months, so here are some thoughts on the different components. Solar panels Love 'em. They look pretty sleek and there are a stack of them (20 in total) and they have an…

The next one will be a bit more about data and cost savings etc.

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Majordennisbloodnok

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24/03/2022 1:39 pm

Thanks for that, @alastair. Apart from the Mixergy cylinder, you've got a very similar setup to us and what you've outlined in your sixth blog post fits VERY closely with our impressions.

We don't currently have an EV, so our usage is inevitably markedly lower than yours. As a result, any excess the solar PV cannot squeeze into the battery during the day is exported via an Octopus Outgoing Agile tariff which is not allowed in conjunction with Octopus Go for obvious reasons. However, given you're saying your EV is being used little enough that you're mostly able to charge from solar, have you done the sums to compare Go (cheap off-peak but no export) with Outgoing Agile (more expensive off-peak but decent export rate)? Presumably you are likely to be covering at least some of that in your next blog post.

105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"

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alastair

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Topic starter 25/03/2022 8:06 pm

@majordennisbloodnok Thanks for your comment. We've not compared the difference between Go and Outgoing Agile directly but you've now got me thinking. I'll see if I can add that into the mix 😎

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alastair

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Topic starter 15/04/2022 8:52 am

This isn't as detailed as some write ups and videos about data to do with renewables and heat pumps, but here is some text (and graphs) about how our house has been doing over the last few months: