Hot water is only warm

[Ashley Rosindale]

I've not noticed that the mains water pressure is higher. I have a pressure gauge set, I might test it out of curiosity.

 

[Madrab]

What are my options if indeed the boiler is functioning correctly yet my expectations haven't been met?

If the boiler is delivering HW to the volume and temperature as designed then there's not a lot you can do, the only trouble you have then is with your installer and that your expectations were possibly not set correctly.

 

[Ashley Rosindale]

I've measured 82 psi (5.6 bar) inlet pressure at a cold tap nearby to the boiler.
I think this sounds a tad high, anyone like to clarify?

 

[Madrab]

Is that 5.6 bar with nothing else running or 5.6 bar with another outlet open? It is a bit high yes, especially if it's dynamic. A PRV may be in order.

 

[Ashley Rosindale]

5.6 bar with no other tap open. So, would that increase the flow rate?

Pressure relief valve or an inline pressure regulator?

What is the 'normal' pressure on mains water?

 

[Ashley Rosindale]

Sorry PRV pressure reducing valve. Yeh ok ,understood.

 

[Doggit]

Do you have a measuring jug that you can check the flow rate with. The 30Kw model should have a flow rate of 12L/minute, so if it's higher than that, even though you've turned the water flow down, it could still be too high.

 

[Ashley Rosindale]

OK, just tested with a 3L jug. Cold tap on full blast filled the 3L jug in 8 seconds.
So, if my maths is correct, that's 2.66L every second.

Does that mean my cold water flow rate = 160L/Min?

Approx figures ofcourse.

 

[Doggit]

Check the hot tap now.

 

[Ashley Rosindale]

Hot tap is 15 seconds to fill 3L.

1L every 5 seconds, = 12L /minute

 

[Doggit]

Okay, so the flow rate on the hot water is to spec, so it has to be an issue with the boiler. What's the hot water temperature on the boiler set to.

 

[Ashley Rosindale]

It's maxed out at 60°c but doesnt reach anywhere near that.

BTW, the 12L/m measurement was with the cold water feed valve to the boiler fully open.

 

[Doggit]

I think is should go higher than 60c, but if it's set at that, but not reaching it, then it could be a dodgy thermistor in the boiler.

 

[Ashley Rosindale]

Yeh, I can't get it passed 60 on the boiler itself. So maybe as you say, dodgy kit.

Lets hope matey solves it on Thursday.

 

[muggles]

Inline flow regulator http://www.advancedwater.co.uk/prod...E588ga8TeNXilAwGfPgFIRJUYoV9J-_RoCM6oQAvD_BwE