Conflicting Gas Engineer Reports

k-knoff

I have a 100 year old property with a Baxi Bermuda 552 and fire in the living room.

I was wondering if someone could help me with conflicting engineers advise. One engineer turned off the heating say that there was not the required ventilation there is a 65cm2 ventilation to outside and they say we need 100cm2 ventilation. There is also ventilation through the rooms and window vents on the top of the windows.
A second engineer said the ventilation was adequate and turned it back on.

I have done some of my own reasearch; Is this the correct formula?

3.69 kw – Fire
16 kw – Boiler

So we will round up to20Kw

20Kw - 7Kw(Advantageous Air due to property age) * 5 = 65cm2 this is what is installed.so minus the allowed 10% variance a 58.5 vent would actually be sufficient.

I guess the Advantageous air as a reduction of 35cm2 from ventilation requirements this is where the minus -7Kw comes from?

Perhaps the first engineer left this out by mistake or was he attempting to rip me off.

I’m really stuck as I do not want to have an unsafe system but I also do not want to be ripped off.

The first engineer had not followed correct proceedure appartently issued an ID and had not put a note on the meter and apparently the ID was not registered with gas safe.

Does anyone have similar experiance?

southcoastrgi

boiler reqs 90cm2 of permanet ventilation, as grills aren't made to that size then 100cm2 is needed, if the vents above the windows are closable ie trickle vents these don't count

your MI here just go through until you get to your model

your boiler would be AR (at risk) & not ID

ID doesn't have to be reg with anyone if you give permission for it to be turned off & capped, if you don't give permission then an ID situation is reported to the gas transporter (used to be transco)

so just to add to your confusion they were both wrong

k-knoff

Thank You, I don't think its actually a 552 looking at the data sheets, it more like the 25/1, I think I will call in another engineer for another opinion.

ollski

Your calculation is fine but rarely used to be honest as the ventilation requirements given in the instructions for the particular appliance over-ride any manual calculation. Trickle vents in the windows don't count, gaps less than 5mm or more than 10mm don't count, vents from 2 sources is usually classed as cross ventilation, the path through the cavity should be ducted.

k-knoff

Its installed in a flat with a small water tank, what model would normally be installed in a flat?

rogerblack

ollski wrote: »

or more than 10mm don't count, v

Err - what?

southcoastrgi

how long is a piece of string, there isn't a norm, the data plate on the boiler will tell you the model & there should be an arrow telling you the output it's been set to

southcoastrgi

rogerblack wrote: »

Err - what?

yeh i couldn't quite get my head around that one either

k-knoff

Yeah I guess I just need to check the data plate when I get home :-)

ollski

rogerblack wrote: »

Err - what?

Sorry meant to write 'don't count' for tricklevents, was trying to point out less than 5mm or more than 10mm not current standard.

k-knoff

It is a baxi bermuda 401 and the vent is 10" (66cm) - which on the guides is the correct venting. I think the first engineer is at it he also put on the ID that it was LFE? Does this mean living fire effect? Because it most certainly is not lol.