Need to renew 17yr old combi boiler.

[sunderswood]

Renewing 17yr old Gloworm combi boiler, running dom h/w and 15 rads, 40% are doubles. Water flow from stop valve has been measured as 6L p/m, is that enough to run system effectively?

 

[gmartine]

Heating will run fine, hot water ideally requires at least 10L/m. How does your current boiler provide HW?

 

[king of pipes]

Gloworm has served you well be guided by your installer but most manufacturers have a boiler to suit what you need , if your water pressure is poor this can be addressed at the same time.

 

[sunderswood]

Heating will run fine, hot water ideally requires at least 10L/m. How does your current boiler provide HW?

Sinks are ok, shower is intermitent, runs cold then hot, bath is the same.

 

[king of pipes]

That will be the domestic hot water plate heat exchanger partially blocked so the boiler cannot loose it's temperature it is creating, so cycles on and off , I would be recommending a replacement as at 17 years old it's well overdue.