Failed install (initial SCOP1.8), clueless installer compounded by poor manufacturer support. Help needed desperately!

Bart · 2025-06-12T05:08:22Z

Hi All, My first post. I've learned a lot from reading this forum, wanted to validate my understanding and thought others might learn from my terrible experience. Having completed a 5 month complaints process and made limited progress with the installer I've now had to escalate to the scheme provider/trade association. Given apparent collusion I'm not specifically sharing details (publicly) of the companies involved at this time. Improvements reducing legionella cycle settings to minimum required (temp 60, scheduling & duration) reducing DHW to minimum required settings (temp 45, scheduling & duration) running in compensation curve setting to discover required water temps for desired internal temps for any given outside temp (45@-2 & 25@15) adjusting flow rate to maintain delta 5-8 (ie. gap between flow and return temps) Freeze stat function disabled as glycol had been added to the system All the above increased COP to 2.7 on a perfect day ie. 30% (Thank you RHH!) Problem The system was short cycling I couldn't achieve internal temp above 19+ regardless of water temp I couldn't achieve a delta 5+ even with pump running at 8l/min (manufacturers guidelines state optimal is 17l/min) and the pump wouldn't couldn't achieve 14+l/min. This suggested: the ASHP was too large for my property AND/OR the radiators were too small the pump was insufficient something else? 1. A 6kwh system had been installed. My heat loss survey=3.6 (however u values, room sizes, layout were all wrong) and it was amended (post install) =3.1 2. The installer 1st requested additional payment for a bathroom radiator, then refused to fit it, then only complied after I refused to sign off completion. However the amended heat loss survey has subsequently found that the kitchen radiator is also too small (K3 needed). 3. As yet no reply at all regarding the pump that can't achieve optimal flow rate 4. Flow/return temps don't tally with flow/return temps at the radiators. Also flow temps never fall below 25 and return temps never fall below 20. "The Game's Afoot" I queried the proximity of the design with the installer and manufacturer At the installer's insistence a sales manager from the manufacturer attended, later emailing: "all I can advise.... it's been installed as per our instructions" and sharing a document that suggests "initially setting min flow temp to 35" (erm I get it my flow temp is low but don't I get to decide how hot my house is?) "You need a volumiser- Yep like a hole in the head" In the interim 3 months the installer had decided to add a 32 litre volumiser in my loft (without my consent) on the longest radiator run in the house not on the main return (although I'd like it on flow for defrost cycles). My entire system was less than 40 litres Narrow delta continues SCOP remains 2.3 Half of the heated volume of water is now located outside the insulated envelope of my house (wasted heat not included in SCOP) Balancing radiators is a nightmare (7 vs 50 litres) The same sales manager has defended this ridiculous decision sharing the turn down datasheet HELP? The manufacturer's home help technical team have yet to respond to my request for 5kw turn down data- can anyone help? I've argued this would appear to show that my ASHP is too large, not that I need a bucket of warm water in my loft- Anyone have any resources that might confirm this please? The missing K3 in the kitchen would add volume but not much. I've argued that a pump that can only achieve 14l/min given an ASHP that requires 17l/min optimal flow isn't compliant as it isn't fit for purpose. Anyone have any resources that might help please? I've argued that flow/return thermostats that don't record flow/return temperatures aren't compliant as they aren't fit for purpose. Anyone have any resources that might help please? Thank you for reading.

Page 3 / 3 Prev

Air Source Heat Pumps (ASHPs)

Last Post by Majordennisbloodnok 60 minutes ago

25 Posts

7 Users

10 Reactions

681 Views

RSS

Majordennisbloodnok

(@majordennisbloodnok)

Noble Member Moderator

Joined: 4 years ago

Posts: 877

08/07/2025 6:04 pm

Posted by: @heacol

↑

@jamespa @editor can you help with some statistics and examples from this platform? It does appear to be illegal and against competition rules. It also appears that DESNEZ consulted with MCS prior to the consultation, as they are mentioned as the preferred option. Again, it is highly illegal for a government department to collude with a private entity for the financial gain of that entity whilst excluding competing organisations with the same certifications and qualifications. Especially as all government legislation for the renewable industry has stated "MCS or another certifying body"

Good point. I wonder if anyone here knows someone in the Competition Commission....

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"

ReplyQuote

Page 3 / 3 Prev

Forum Jump:

Previous Topic

Next Topic

Currently viewing this topic 1 user ( Brendon Uys ) and 3 guests.

Recently viewed by users: benson 9 minutes ago, Majordennisbloodnok 60 minutes ago, Toodles 1 hour ago, Bart 21 minutes ago.

26 Forums
2,104 Topics
46.3 K Posts
66 Online
3,393 Members

Forum Icons: Forum contains no unread posts Forum contains unread posts

Topic Icons: Not Replied Replied Active Hot Sticky Unapproved Solved Private Closed

RE: Who has a V2G EV installation

@agentgeorge, I was also more interested in using a car...

By Majordennisbloodnok , 30 minutes ago
RE: Aira Heat Pump: Stylish Scandinavian Heating

Thanks @mikeh. Then I will also go back to non smart ta...

By ChandyKris , 52 minutes ago
RE: Failed install (initial SCOP1.8), clueless installer compounded by poor manufacturer support. Help needed desperately!

Good point. I wonder if anyone here knows someone in th...

By Majordennisbloodnok , 60 minutes ago
RE: Who's your electricity provider and what's your tariff?

Yes. Just focusing on specific months, our average impo...

By Majordennisbloodnok , 1 hour ago
RE: Location of hot water isolation valve on cylinder

@transparent Thank you so much and very helpful. Earlie...

By rossowheels , 22 hours ago
RE: Ecodan consuming 100kwh per day in new build!!!

It does indeed look like that, @skyefarmer. There is ...

By Majordennisbloodnok , 1 day ago
RE: Plug and play solar. Thoughts?

Have a read of my previous posts on so-called Balcony S...

By Lucia , 2 days ago
RE: Compressor attempts start but fails - Nibe Fighter 2005 8kW

"To tell you the truth, I don't know if HAL is homicida...

By Scalextrix , 2 days ago
The Importance of Radiator Balancing for Efficient Heating: Introducing the Flow Regulating Valve

It’s fascinating to watch how low-temperature heating i...

By Mars , 3 days ago
RE: Servicing Hitachi HP in rural Somerset

I'd give GreenGenUK a call or email them: sales@greenge...

By Mars , 3 days ago
RE: Heating coming on when not required

I played with a max heating temp but there is a world o...

By JamesPa , 4 days ago
RE: Pressure drop Primary circuit

I've always regarded topping up heating systems as my j...

By JamesPa , 4 days ago
RE: Heat pump solutions and/or installer recommendations for France

I’d travel to France for work if you were struggling wi...

By Damon Blakemore , 4 days ago
RE: 5 Star Service from Havenwise

That's always a danger with any new good idea, @morgan....

By Majordennisbloodnok , 4 days ago
Have your say in the Renewable Heating Hub Awards

It’s time to celebrate the best (and call out the worst...

By Mars , 5 days ago
RE: ASHP service costs

@ashp-bobba And super happy fish too I expect 😊...

By Toodles , 5 days ago
RE: Mitsubishi cycling while on chilled water output

@iaack yes there's no denying that cold air sinks! I s...

By downfield , 5 days ago
RE: Weather compensated secondary circuits with Biomass

@andycoo that flooring sounds ideal. Extra volume is ...

By Sune , 5 days ago

Forums

Failed install (initial SCOP1.8), clueless installer compounded by poor manufacturer support. Help needed desperately!

Join Us!

RHH Awards

Latest Posts

Members Online