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[Solved] Installing your own ASHP - DIY

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(@tomasmcguinness)
Eminent Member Member
135 kWhs
Joined: 5 months ago
Posts: 15
Topic starter  

So I’ve started thinking seriously about a self install and I’ve come up with a roadmap.

1. check existing pipework can handle the flow rate.

2. Perform a hear loss on my house.

3. Assess the radiators.

4. Compute pressure loss of the index circuit with existing pipework.

5. Work out what needs to change with existing pipework and radiators.

Once Ive done that first pass, then I’ll look at siting the pump, drainage, noise assessment and then apply for planning permission (but Im hoping they change the 1m boundary rule by that time!)

Whilst all this is going on, I’ll be doing the Heat Geek courses to help me understand more about the design!

Im also going to look into an MCS Umbrella signing off my installation, so I can take advantage of the BUS grant.

I’ve completed the first step, checking the flow rates will work, and it looks like I’m mostly okay. 

You can check out my video - Road to a Heat Pump - Checking my existing plumbing - Part 1

This post was modified 3 months ago by tomasmcguinness

Owner of a ridiculously oversized 35kW boiler and trying to make it as efficient as possible. 4.8kW solar PV with 5.4kWh storage. EV driver.
Follow my journey at https://www.youtube.com/@tomasmcguinness
Next big project is a heat pump!


   
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(@bontwoody)
Noble Member Contributor
2943 kWhs
Joined: 2 years ago
Posts: 418
 

Nice video Tom. Well explained 😁

House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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(@tomasmcguinness)
Eminent Member Member
135 kWhs
Joined: 5 months ago
Posts: 15
Topic starter  

Thanks!

Owner of a ridiculously oversized 35kW boiler and trying to make it as efficient as possible. 4.8kW solar PV with 5.4kWh storage. EV driver.
Follow my journey at https://www.youtube.com/@tomasmcguinness
Next big project is a heat pump!


   
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(@ianmk13)
Estimable Member Member
1207 kWhs
Joined: 1 year ago
Posts: 72
 

Very interesting, @tomasmcguinness. You're a step or two ahead of me, I think. Can I suggest care with references to DeltaT in your videos, though, to avoid potential for confusion; suffix with 'boiler', 'radiator', or whatever.


   
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(@tomasmcguinness)
Eminent Member Member
135 kWhs
Joined: 5 months ago
Posts: 15
Topic starter  

@ianmk13 Thanks. I'll bear that in mind in future videos. I know after looking at that against, that my explanation of a few things was off. Learning never stops!

Owner of a ridiculously oversized 35kW boiler and trying to make it as efficient as possible. 4.8kW solar PV with 5.4kWh storage. EV driver.
Follow my journey at https://www.youtube.com/@tomasmcguinness
Next big project is a heat pump!


   
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(@tomasmcguinness)
Eminent Member Member
135 kWhs
Joined: 5 months ago
Posts: 15
Topic starter  

The work continues! 

I've finally finished doing my simple heat loss calculation. Long delay getting this video out as I was doing the Heat Geek Mastery course. 

In this video, I do a simple explanation of heat loss, how I approach it and then I run through all the numbers for my house.

It shows my heat loss is going to be around 7kW, but I need confirm this by using a professional tool (which will be my next video!)

 

Owner of a ridiculously oversized 35kW boiler and trying to make it as efficient as possible. 4.8kW solar PV with 5.4kWh storage. EV driver.
Follow my journey at https://www.youtube.com/@tomasmcguinness
Next big project is a heat pump!


   
Derek M reacted
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(@ianmk13)
Estimable Member Member
1207 kWhs
Joined: 1 year ago
Posts: 72
 

@tomasmcguinness Have you been able to perform any sanity check on that figure?  I'm thinking of the 'divide annual gas consumption by 2900' rule of thumb, for example.  My own heat loss calculation that I did last year came out at around 13.5 kW but I tended to err on the pessimistic side.  'Air change' seems to have a big effect on the numbers, for example. The above rule of thumb using several years' worth of data resulted in a figure of 9-12kW. The higher figures were from years when we were at work during the day and I was running the heating largely for the two periods we were home and awake, so probably very inefficient.  I've now downgraded my guesstimate to 10-11kW based largely on what I have gleaned from this forum. I've been monitoring my heating closely this heating season but there have been too few really cold days here in Buckinghamshire to make any helpful conclusions.


   
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(@hughf)
Noble Member Member
2943 kWhs
Joined: 2 years ago
Posts: 482
 

I’m in the DIY camp, completed the install last September and it has been running 24/7 since then.

Slightly different choice of install (15m up the garden from the house) and choice of emitters (rads and fan coils), but it works nicely.

I spent a bit mind you, close to £10k for all the parts for what ended up a completely new system, even down to changing all the primaries.

Heat loss and rad sizing were done with the freedom heatpumps spreadsheet and cross checked with heating engineer.

This post was modified 1 month ago by HughF

Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.

My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.


   
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