Vokera Linea 28

[Saw Horse]

Basic boiler that has always proved reliable until last week when a noticeable drop in domestic hot water was noticed. No worry, I have a British Gas service contract, and the next day the engineer without removing his jacket or opening tool box, diagnosed a blocked heat exchanger and left. Came back next day with new HE only to find, slightly embarrassed, no difference? He deliberated and muttered for half an hour before announcing a new boiler was needed!

He may be right, but then again what happens if the problem still remains after the expense of a new boiler. I would appreciate any advice regarding possible cause of this drop of hot water pressure. Many thanks to all.

 

[Saw Horse]

Apologies, should of mentioned it is a combi boiler.

 

[rules&rulers]

is it a drop of water temperature
or
drop of hot water flow rate.
should be fixable.

 

[vulcancontinental]

Fixable, you need to ask for an engineer who knows what he's doing. Simple reliable boiler.

 

[Agile]

They are totally repairable.

Seems the engineer was rather less than competent. If he tells you that a new boiler is required then he needs to be able to tell you what is wrong and why it cannot be repaired.

You need to complain to BG and get them to send a better engineer. But do it as a formal complaint, ideally in writing. Not just an annoyed telephone call to a telephone call handler.

As a last resort, and to prove to BG that it is repairable, you might be able to get Vokera to do a fixed price repair on it and then reclaim the cost from BG. But only after you have given BG a chance to respond to your complaint.

Tony

 

[Saw Horse]

Domestic hot water temperature is fine (so are the radiators), just experiencing lower than normal hot water pressure. Just feeling frustrated it could be a simple solutions.

 

[Saw Horse]

Forgot to mention boiler pressure holds steady, and I have used the filling loop to slightly increase pressure, but this did not result in an increase in hot water pressure.

 

[Agile]

How are you measuring the pressure?

I suspect you really mean the flow!

You could put it in engineering terms and tell us in litres per minute. Should be very approximately 10 litres per minute.

Tony

 

[Terrywookfit]

Knackered Flow restrictor ???

 

[DP]

What does the display indicate when you run hot water?

Now increase the setting on HW thermostat, does the display numbers increase?

 

[ianmcd]

Knackered Flow restrictor ???

Terry is correct the flow restrictors on these are prone to swelling and restricting the flow, have an engineer who knows the boiler to remove it and set the flow rate up via the inlet valve and lock it at the correct flow rate

 

[Saw Horse]

If it helps, flow rate 3.6 litres per minute and if I increase pressure (Bar) from the usual 1 to 1.50 or 1.75, there is no increase in flow rate. If I increase the HW thermostat the display numbers rise. Thank you.

 

[vulcancontinental]

Terry is correct the flow restrictors on these are prone to swelling and restricting the flow, have an engineer who knows the boiler to remove it and set the flow rate up via the inlet valve and lock it at the correct flow rate

They've change that feature on the iso valves now I think but that Linea could have it.

 

[ianmcd]

They've change that feature on the iso valves now I think but that Linea could have it.

personally David I fit a ballofix on the cold water inlet and bin the flow restrictor, as in Scotland the small O ring tends to swell with the chlorine content of our water and I set the flow rate with the ballofix, yes has the usuall problems about which time of year you set it up, but have seen the Alpha seasonality valve among others and havent came across one yet that actually works in my own humble opinion of course

 

[Terrywookfit]

If it helps, flow rate 3.6 litres per minute and if I increase pressure (Bar) from the usual 1 to 1.50 or 1.75, there is no increase in flow rate. If I increase the HW thermostat the display numbers rise. Thank you.

The flow restrictor needs checking.