An inspiring DIY ASHP installation
Super interesting DIY ASHP installation by @iancalderbank: https://renewableheatinghub.co.uk/my-diy-ashp-install
Buy Bodge Buster – Homeowner Air Source Heat Pump Installation Guide: https://amzn.to/3NVndlU
From Zero to Heat Pump Hero: https://amzn.to/4bWkPFb
Subscribe and follow our Homeowners’ Q&A heat pump podcast
@bontwoody - replying to your question on the article - its easier to reply in the forum.
28mm plastic pipe inserts have a bore of about 21mm - so if you have lots of them in the path it matters. but if you use engineeringtoolbox.com, you work out the head loss for that specific length at that flow rate and bore size. then add up the head losses over the whole run. provided the section with small bore size and a higher head loss per m is very short, it contributes nothing significant to the the overall head loss and thus achievable flow rate. whereas an undersized diverter valve or mag clean can burn 1m or more of head. If you've only 5kw to transfer your target is lower so easier to achieve. be careful with the 15mm plastic - do the maths on throughput per radiator.
in my case after 1 week of running, I'm maxing at 30l/min. need to do some more testing to prove what section needs to be to be redone to push it higher. Steady state for a 21C target at 7C outside is 15l/min, 4.5kw output, COP 3.0, LWT 38, so happy-ish for 1 week in. but I know there's a group of 4 rads fed by a 3m run of 22mm plastic that are getting lower flow temps than the rest (I've got monitors on everywhere), making it hard to balance the system. My overall DT is a little lower than I'd like (between 2 and 4, averaging 3) . and my strong suspicion is it's that 22m feed thats slowing the overall rate down, so next step will be to replumb that group when its warm enough to shut the system down. I built a whole new primary side but there are bits of the secondary side that I know aren't up to spec.
My octopus signup link https://share.octopus.energy/ebony-deer-230
210m2 house, Samsung 16kw Gen6 ASHP Self installed: Single circulation loop , PWM modulating pump.
My public ASHP stats: https://heatpumpmonitor.org/system/view?id=45
11.9kWp of PV
41kWh of Battery storage (3x Powerwall 2)
2x BEVs
- 22 Forums
- 2,067 Topics
- 45.3 K Posts
- 22 Online
- 3,338 Members
Join Us!
Trusted Installers
Struggling to find a reliable heat pump installer? A poor installation can lead to inefficiencies and high running costs. We now connect homeowners with top-rated installers who deliver quality work and excellent service.
✅ Verified, trusted & experienced installers
✅ Nationwide coverage expanding
✅ Special offers available
Latest Posts
-
RE: Load Compensation and Weather Compensation
@editor there seems to be a fair bit of interest in thi...
By AndrewJ , 4 hours ago
-
Move to a different contractor, 16mm pipe every day not...
By Johnmo , 6 hours ago
-
RE: How accurate was your heat loss survey?
For me: Two full surveys (each taking 3hrs, one of whic...
By JamesPa , 6 hours ago
-
RE: Nibe F2040 periodic warm water increase fails
Ok. The key point I think you have made is that the er...
By JamesPa , 6 hours ago
-
RE: Air Changes per Hour - ACH and the MCS requirement
@matwin If you plan to commission one it might b...
By JamesPa , 7 hours ago
-
RE: Jokes and fun posts about heat pumps and renewables
In a similar vein, this recent spell of sustained good ...
By Majordennisbloodnok , 12 hours ago
-
RE: Home energy storage & battery register
By the end of next month... 8 kW PV + Tesla Powerwall...
By Algienon , 13 hours ago
-
RE: Enabling WiFi: Samsung ASHP on Smart Things App
@grahamh-uk Yes, I have the same Samsung controller p...
By Old_Scientist , 14 hours ago
-
RE: Various different approaches to battery storage.
I thought I'd share my story/journey and experiences he...
By Old_Scientist , 15 hours ago
-
RE: Commencing on an ASHP Installation Process
It varies by room, but the conservatory is assumed at 2...
By Sheriff Fatman , 19 hours ago
-
RE: Antifreeze top up for my heat pump - is this a rip off?
@editor @sallyl As Mars said, there are 2 different typ...
By Brendon Uys , 1 day ago
-
RE: Renewables & Heat Pumps in the News
Here on the Forum we're going to need to be increasingl...
By Transparent , 2 days ago
-
What I Wish I Knew Before Installing a Heat Pump
I’m putting together the next Homeowners Q&A episod...
By Mars , 2 days ago
-
RE: Planning Update: 1 Metre Boundary Rule for Heat Pumps Has Been Scrapped
In Scotland they still follow the MCS rules, so the noi...
By Johnmo , 2 days ago
-
RE: Getting the best out of a heat pump - is Homely a possible answer?
@johnmo and @benson Thanks! I was aware there was a p...
By MarcT , 2 days ago
-
RE: Is your heat pump insured?
My insurer just asks the question: "Is your home heated...
By AndrewJ , 2 days ago
-
RE: Vaillant & OVO partner up to offer Heat Pump Plus
Slippery slope starting
By Johnmo , 3 days ago
-
RE: Say hello and introduce yourself
@cathoderay Ah yes, that’s the name! The Heat Pimp, It’...
By Toodles , 3 days ago
-
By the way, I also think our industry need to get on bo...
By ASHP-BOBBA , 4 days ago