The guy replied to my email and said that he'll speak to his merchants 'to see if there's anything they can do to help you. In the mean time please give me the model number of your pump.'
It's something I suppose.
But I'm thinking he'll be helping you not me, because if he gets nowhere, I have to call Grundfos round to take a look and if they state that the installation was insufficient, I'll a) be paying for their visit and b) paying for a new pump, all the while with an unsuitable install damaging the replacement pump I've had to shell out for.
He's coming round in a week to check the floor but I'm guessing he'll play the cheap tiles card.
Just to pick up on the point that Alarm raised, I mentioned the issues to the installer very soon after the install was completed, but he just kept saying he'd never had any problems with his methods and it must be niggles with the system. I mentioned the pulsing on other taps being used, the water starvation and the sound of air in the pump. Knowing at that time absolutely NOTHING about plumbing, I took him at his word. Silly me.
namsag, many thanks for that. To address your points:
- Installation manual requires 22mm supply pipes.
- He hasn't teed off the vertical vent pipe for the hot supply. He seems to have teed off at the bottom where the hot cylinder fed the bath (before pump fed bath).
- He teed off for the cold above the hot water cylinder from the cylinder supply pipe, using 15mm pipe and a 90 degree elbow.
- Grundfos site states two years warranty for this pump. Ours is just over that.
- Cylinder stat now turned down to 50.
What do you think of my draft reply?
"Hi
The model number is STC-2.0 C. It’s a Grundfos Watermill Niagara 2.0 bar. There’s another number on top of the pump: xxx. I assume this is the serial number. Thanks for your help with this.
If you have no luck with the merchants, I guess I’d have to get someone from Grundfos round to have a look, but the concern I have with that is that the installation manual states that a dedicated feed with 22mm pipes must be used for supply, with an Essex or Surrey flange to the hot tank to avoid sucking air into the pump. If Grundfos try and wriggle out based on this then I’ll end up paying for their visit as well as a new pump, and potentially replacement pipework to satisfy the warranty in case it breaks again. I notice that the Salamander technical documents require 22mm supply pipes also. I know you say you’ve had no other issues, but that fact won’t help me if Grundfos reject warranty claims due to a non-compliant installation.
Regards"