Combi Boiler - Hot Water

[WoodenPlank]

Seems that way. The kitchen tap is ~8 l/min hot water only and drops to ~3.5l/min when adding the cold to get it to a desirable temp.

Yes cold water is ~13l/min.

I'll try reducing the hot water temperature so need less cold water to get a reasonable temperature

Thanks for all your help. Feel a lot better knowing what's going on!

 

[martyndc88]

I'd definitely double check the boiler hasn't been piped up backwards on the hot and cold

 

[jalefa]

I'd definitely double check the boiler hasn't been piped up backwards on the hot and cold

If you got good flow rate at the taps but maintenance menu is saying 6ltrs a mins it's as @martyndc88 has said above or something is passing for definite!

That'll be the issue

 

[WoodenPlank]

WB senior engineer came again this morning

I asked them to check that the boiler had been piped up correctly and he confirmed it was fine.

He couldn't find anything else wrong - suggested getting the bath tap changed as it should be a thermostatic mixer rather than just a normal mixer (?) tap and to call the water board. I'm pretty sure he kept saying pressure when he meant flow rate, but I'm no plumber...........

I'm thinking there must be a blockage somewhere. That or I need very high flow rate taps and shower head so to get a normal warm temperature, the hot water flow rate is enough to keep the boiler on!

Not sure there's anything else I can do at the moment - perhaps replacing some taps and reducing the hot water temperature at the boiler further.

Thanks all for your help, it's comforting to know it's definitely a flow rate problem, even if I can't fix it right now (even though the WB guys wouldn't listen and kept thinking it was overheating until I showed them when it cut off at 2.5l/min flow rate!)

Cheers

Plank

 

[martyndc88]

If you are certain that's it's Purely a flow issue when running hot water then you could always fit a booster pump on your hot water pipe as it exits the boiler. As long as your mains water pipe coming in can deliver the water. I did fit a pump once and the mains was so restricted that it would just pull the main dry. Had to lay a new mains.