Turn-off valves

[ash1]

Just a quick qusetion, have some 15mm fitted to my hot and cold feed to the bath/shower and was wondering if they can slow down the rate at which the water flows, only reason I ask is because it seems to take forever to fill the bath. Combi boiler puts out about 17L per min and i`m getting nowhere near that. BTW the mains pressure is more than sufficient. Many thanks

 

[chrishutt]

Combi boiler puts out about 17L per min and i`m getting nowhere near that

That's unusually high flow rate for a combi - what model is it?

15mm pipe won't restrict flow at such low rates anyway. It would help if you could tell us what flow of hot water you are getting.

 

[ash1]

Its a worcester Greenstar 40CDi, and the flow rate at the mo is about 10L per min.

 

[chrishutt]

When was the boiler installed? Has it performed properly previously, particularly last winter?

I will have a look at manual for this one....(have you done the same? What does the fault finding section suggest?)

 

[ChrisR]

INput filter blocked or "high pressure" taps? Diagnose by checking flow at all taps. (individually and together)

 

[chrishutt]

Just checked - the DHW flow rate for this boiler of 17.3 litres/min is with a temp differential of 30C. At 40C it's 14 litres/min. Given the cold weather, incoming cold water is lower and so the 40C differential (e.g. inlet temp 5C, outlet temp 45C) might be more relevant.

The highest flow rate requires a dynamic (running) water pressure at the inlet of 1.7 Bar, which you might not have, even though you say water pressure is good.