PigletJohn, on a scale of 1-10 how stupid is it doing DIY on your boiler?

[VivaLeBeaver]

Came home to no power. Dd reports some major banging from the utility room and then all power went off earlier in the day.

I investigate and find the utility room half flooded and water dripping out the boiler.

Dh has diagnosed a cracked heat exchanger and has ordered a new one and is going to fit it. He reckons it looks a simple job to fit.

I have concerns about him not being a plumber and carbon monoxide. In his defence he's an electrical systems engineer for power stations so fairly clever about stuff.....just maybe not domestic boilers

It is generally discouraged. Some people will tell you it is illegal, which is not strictly true unless you are working on other people's boilers.

Older boilers may have cases which form a pressure seal to prevent fumes leaking into the room.

It's about 13 years old. I think after Dh has fixed it I might get a plumber round without telling him to service/check it.

I asked a similar question a couple of weeks ago, although with us it was the circuit board. DP is an electrical engineer.

I got a gas engineer to come and sign it off afterwards, it was fine.

Not sure I'd have let him near the gas parts though! I'd definitely get someone to check it for your own peace of mind.

he is competent which is not Competent unless he holds a gas safe cert. Get a CO monitor and consider getting a gas safe person to check it. If you do get a problem you could have insurance issues.