Huge gas pressure drop between meter and boiler. Help!

[ianmcd]

Yea, and ecotec plus comes in Combi, System or heat only versions, he later says its a 630 Which is a system boiler.

better than the usual , I have a gas boiler and the pilot is not working, what is wrong with it

 

[fixitflav]

Yea, and ecotec plus comes in Combi, System or heat only versions, he later says its a 630 Which is a system boiler.

OK, looks like I (and maybe others) jumped to a conclusion that it's a combi. It must be a big house if it needs a 30kW system boiler. But it doesn't change anything about gas flow, pipe size and pressure drop.
Be interesting to know the output of the previous boiler, if the OP knows. If that was also 30kW, it might give the installer a bit of a get-out.

 

[ScottishGasMan]

If that was also 30kW, it might give the installer a bit of a get-out

It doesnt.

It must be a big house if it needs a 30kW system boiler

If it needed 30kw then yes, it would be a very very big house, but again, chances are it needs much less.

 

[HERTS P&D]

better than the usual , I have a gas boiler and the pilot is not working, what is wrong with it

You need some Diyers to argue over what's wrong with it!



Andy

 

[DP]

OK, looks like I (and maybe others) jumped to a conclusion that it's a combi. It must be a big house if it needs a 30kW system boiler.

Silly question, why would you think that?

There could be a very good reason why that power of boiler has been specified

 

[ScottishGasMan]

Silly question, why would you think that?

There could be a very good reason why that power of boiler has been specified

Personally disagree there, the only reason folk oversize them massively, is they cant/wont do heat loss calcs. It could be that they have a 6 bedroom Victorian house with single glazing and 500l of unvented. But in my own experience 90% of the time theyve just went for a big boiler so they can have very fas heat up times at the expense of any system sizing/efficiency.

Its ironic the number of time I've seen boilers way over spec with gas inlet pressure issues to find that if they had just fitted a more appropriate size of boiler then the gas pressure would have been fine, install would have been cheaper, and efficiency would have been better.

 

[davecon70]

Wow this thread is really moving on quickly. I have to say that I am very dubious about the installation especially as he installed it in situ and didn’t mention that the clearance was incorrect. That makes me wonder what else wasn’t correct.

here are some photos at long last!

 

[BlueLoo]

11c/+65c return delta on a condensing boiler?

Edit: and the ABV rammed nr closed.

 

[ScottishGasMan]

See theyve not bothered to note the CO or CO2 readings, or any readings on low. But like I say, they didnt get 20mbar on meter and boiler which has been written in there so I'd not trust anything else written anyway.

 

[ScottishGasMan]

Nevertheless, it changes nothing. the boilers running safe. so I'd not loose any sleep over it. If working pressure is lower than 13mbar next service with meter pressure still the same then you can assume there is a restriction building in the gas line.

 

[BlueLoo]

Nevertheless, it changes nothing. the boilers running safe. so I'd not loose any sleep over it. If working pressure is lower than 13mbar next service with meter pressure still the same then you can assume there is a restriction building in the gas line.

Safe but not correct surely?

You won't be condensing at 65c return will you, nor will you have a working bypass?
(Unless it's not needed and has been locked down)?

 

[ScottishGasMan]

Safe but not correct surely?

You won't be condensing at 65c return will you, nor will you have a working bypass?
(Unless it's not needed and has been locked down)?

System boiler, so unless its been fitted with vaillant controls which I imagine its not, then you need the higher flow temp for DHW production. Had it had vaillant controls then you could select independent flow temps for heating and then higher one for DHW (or even lower for DHW and weekly legionella cycle)

ABV not required by this boiler, so wont have any real effect on it.

 

[ianmcd]

I have the certificate-

Central heating mode
Burner operating pressure 20 millibar

domestic hot water mode
Burner operating pressure 20 millibar

Yet your benchmark pic is blank ?

 

[davecon70]

Yet your benchmark pic is blank ?

I’m confused. It’s not blank- there are some figures on it but to be fair I have no idea what they relate to and or if they’re correct.

he’s coming tomorrow- any advice on what to ask him or tell him to do?

 

[Harry Bloomfield]

Had it had vaillant controls then you could select independent flow temps for heating and then higher one for DHW (or even lower for DHW and weekly legionella cycle)

Although you do lose the ability to simultaineously heat water and the radiators. It will only do one or the other at any point in time, prioritising heating the water until demand is satisfied.