Combi boiler and water flow

[Mrs doubtful]

have never had a combi boiler before so just thought my issue was how it is but after speaking to others it seems it's not so any useful advice and remedies wd be good

Moved in 2 years ago and had a new Worcester boiler installed almost straight away. When I run a bath I have to first run the hot then turn off and run the cold. If I switch both on all the power and flow from first tap goes.

This could also be while my shower alternates from hot to cold within seconds and keeps doing so throughout
T even tho no other water in the house is being used. It's not elec shower.

Am just getting bathroom re done so if I have a problem whatever it is I will try to get it fixed at same time

 

[Agile]

Surely you can only turn the cold tap on just slightly?

Taps are fully variable devices and you can set any flow rate you choose.

 

[Mrs doubtful]

But if I turn the cold water tap on the water coming from the hot water tap goes to less than a trickle

 

[HootingOwl]

Whoever fitted the combi should have warned you about this. You need to look at the cold water wain serving your house. Insufficient flow rate to support both taps open at the same time.

 

[ianmcd]

Its nothing to do with your boiler as Hoot correctly says it is your incoming water supply, it might be possible to sort just by using your taps differently , your plumber fitting your new bathroom should be able to advise

 

[oilboffin]

Is the combi an oil boiler or gas

 

[Agile]

I still don't understand why you want to run so much cold water.

If it is just to get cooler water then most combi boilers do have a control to vary the temperature of the hot water.

Unfortunately some of the cheaper Worcester boilers don't have a temperature for the hot water.

Tony

 

[Mrs doubtful]

Thanks for all the replies