Who are gas safe??
What checks and due diligence did you do before engaging this installer?

Who are gas safe??
you should have checked their registration card before they started
I think I've been asked for it onceTo be fair how many times had your dad seen the light of day?
Since I've had heated windscreens, mine only comes out when the new one arrives to replace it.![]()
With respect, that is totally irrelevant.Is the gas supply to boiler in 22mmm?
@kdot get an rgi out to assess what's going on. This is your priority. And, check up on your installers credentials to make sure he is legit. If not, you don't want him back.
You can't afford NOT to have this situation professionally appraised. If your cooker/hob has FFDs you will have protection... BUT... you won't know that, hence get someone out. In the meantime, switch boiler off if using hob.
You need to get somebody in to look at it, but my guess is the combi replaced a non-combi. Combis are usually rated over 2x the power output needed for heating the house, due to the instantaneous hot water requirement. That means higher gas flow and the original pipework might be too small.Thank you!! I shall do this xx
Unfortunately most gas engineers do not put pen to paper and work out the right sized pipes for your system.. I'd say 90% of them don't and 95% of the time they will get away with it.

It's called real life experience. No one can work out gas pipe sizing without putting pen to paper; now if you believe that most RGI's do the arithmetic for every install then either you are beyond naive OR you are one of the cowboys that believe you can determine if the pipes are appropriately sized by just looking at them. I suspect you are the latter.Where are you getting these statistics!
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local