HEATING BOILER

Gary2

The plumber I used to refit my central heating boiler is refusing to provide me with a corgi registration certificate because he say the boiler is to small for the property. The boiler is a ideal logic plus 30kw, the house is 4 bedroom with 12 radiators. He is saying I need a bigger boiler.

tacpot12

I would have thought that 30kW would be ok for a 4 bedroom house, but the determination needs to be made based on the heat loss of the house. (We have a 24KW boiler, and have a five bedroom house with a mixture of solid and cavity walls, and poor insulation, we have 10 radiators.)  

The plumber should have checked the heat loss from the house before deciding what size boiler to order and fit. It's a bit late now for him to decide he got it wrong.  

I would ask for the heat loss calculations and get them shared either here or on a plumber's forum to get them checked. If they show that a 30kW boiler is suitable, you know he's trying it on. If it isn't big enough, you might have to give him the price difference between a 30KW boiler and the next size up. He should suck up all the rework costs. 

If you have home insurnace, check to see if you have legal expneses cover. If you do, give the legal helpline a call and they will guide you how to get him to resolve the problem. 

And strictly it isn't a corgi registration certificate, it is a Building Control Completion Certificate, which is issued by GasSafe via your plumber.   

karenburton1305

When I was looking for info about boiler sizes last week I found this one from toasti - might help equip you with some more knowledge? You might already know it all but thought it was worth sharing just in case!

homersimpson246

The gas safe certificate is nothing to do with whether the boiler is big enough to heat the property, its purely whether the boiler works and is safe for continued operation.

If the boiler isn't big enough then all that happens is when its really cold outside the boiler will run continuously and still won't be able to heat the house.

It would have to be a huge house with very poor insulation for a 30kW boiler to be insufficently sized.  I used to work in an old chapel that was converted to offices, the floor area was around 200m2, it had very little insulation in the roof and single glazed windows and it only had a 30kW boiler.

Another_Level

Have a look on the ideal heating.com. 
https://idealheating.com/boiler-size

Some info from gassafe (England&Wales only.

https://www.gassaferegister.co.uk/media/2178/notification-factsheet-for-consumers.pdf

Seems odd the reason given 

Jeepers_Creepers

Gary2 said:

The plumber I used to refit my central heating boiler is refusing to provide me with a corgi registration certificate because he say the boiler is to small for the property. The boiler is a ideal logic plus 30kw, the house is 4 bedroom with 12 radiators. He is saying I need a bigger boiler.

Somethings surely amiss here?! That just doesn't make sense.

This guy actually fitted/refitted this boiler, then refused a GS cert claiming it's the wrong size? That cannot be right.

What kind of boiler is this - a combi, I'm guessing? In which case it probably has the best part of 20+kW available for heating, and this is enough for most houses.

Can you clear up the weirdness here, Gary?

Jeepers_Creepers

6 to 26kW output to CH - plenty.

onomatopoeia99

Gary2 said:

The plumber I used to refit my central heating boiler is refusing to provide me with a corgi registration certificate because he say the boiler is to small for the property.

They're about a decade too late, CORGI stopped doing gas certificates in 2009 so something's not right here.

coffeehound

Is it due to multiple bathrooms rather than c/h capacity?  Actual instantaneous power required for heating will be under 10 kW

Rosa_Damascena

Have you checked that this chap is actually on the GasSafe register?

southcoastrgi

I think we need a bit of clarity from the op, 
what do you mean by "refit" ?,

As others have said it hasn't been corgi for 12 years,
if it's a new boiler/install they have to register it with gas safe by law & that will generate a building compliance cert,
the boiler might be crap but it isn't too small.