Has my builder ruined my boiler?

[OffshoreGas]

Didn’t say to fit a zone valve did I. OP alluded to the rebuild of the boiler which I was questionning

Sorry, I didn’t read it as the boiler had been rebuilt some time before the builder had worked on the system.

 

[OffshoreGas]

As you say however you are well within your rights also to refuse access if you feel they have acted outside scope or unlawfully

It’s generally not looked on favourably by the small claims court if you’ve refused to give a contractor fair chance to put right what may be an honest mistake.

Neither the pipework nor electrical work is notifiable under building regulations so not sure how you’d prove the guy wasn’t competent.

 

[Riley]

Again I was referring to whether or not the builder had acted unlawfully in terms of working on the boiler. They don’t get a second chance there

 

[OffshoreGas]

A 30s google search turned up the manual for your boiler, in section 1.6 it clearly stares the diverter valve must be open to fill the boiler. See attached image.

Doesn’t sound like your builders sub contractor has done anything wrong here.

 

[Welder]

Don't blame you for keeping it. I'm keeping my Glow Worm Ultimate going for as long as I can.

We've taken condensing boilers out which have been 6/7 years old which were beyond repairing. Admittedly these were probably ones that haven't been well maintained or fitted well.

My Ideal Mexico is of 1997 vintage

On a sep note, efficiency ratings as specified by all manufacturers are ONLY seen by a VERY small number of UK home owners.
Why?
The efficiencies are calculated at a flow temp of 50 degrees C and a return of 30 degs C. However, most UK home owners would claim the system is faulty at such low flow temps so new (efficient boilers) are commissioned to run at a flow of 70 & (at best) a return of 50. This delivers just a few % of potential and rarely (if ever) pays back the investment.

 

[OffshoreGas]

My Ideal Mexico is of 1997 vintage

On a sep note, efficiency ratings as specified by all manufacturers are ONLY seen by a VERY small number of UK home owners.
Why?
The efficiencies are calculated at a flow temp of 50 degrees C and a return of 30 degs C. However, most UK home owners would claim the system is faulty at such low flow temps so new (efficient boilers) are commissioned to run at a flow of 70 & (at best) a return of 50. This delivers just a few % of potential and rarely (if ever) pays back the investment.

How do you achieve that then?

Increase the resonance time/reduce flow rate through radiators?

Surprising in this day and age of smart TRVs there not measuring flow/return temp.

 

[Welder]

How do you achieve that then?

Increase the resonance time/reduce flow rate through radiators?

Surprising in this day and age of smart TRVs there not measuring flow/return temp.

Achieve what?

 

[OffshoreGas]

Achieve what?

The temperature differential across the radiator.

 

[Welder]

The temperature differential across the radiator.

Flow rate. Slower the flow rate higher the temp drop.

 

[Michael1960]

If I accept what you are saying and I bow to your superior knowledge. I don't need to call the builder back. I just need a competent Gas Safe plumber to investigate and fix the problem? Know any good and qualified trustworthy central heating engineers in the North West London area?

The emphasis being "plumber" or heating engineer !