Advice needed please for Chaffoteaux Britony 2T multipoint

[theraspberryone]

Hello,
Hopefully this is the right place to post this.
I have had this water heater for about 20 years and it developed a leak. The heat exchanger has been replaced with a brand new one and the gas section and water section replaced with a re-furbished one.
It is all working now but the flames are very fierce and look yellow to me and it makes a terrible noise, like being in a wind tunnel, and when I turn on the cold water at the same time it gets worse.
The gas engineer said it is fine but I am worried it is going to blow up!
Does this sound right?
Many thanks for replies.

 

[oz-plumber]

Probably won't blow up due to gas - but it sounds like the heat exchanger may explode.
Should douse the flames before the fire could do much, if any damage.

Who convinced who regarding the repairs?

Did you convince the plumber to repair the unit or did the plumber convince you to repair the unit.

Either way - you either got ripped off by the plumber, or you convinced the plumber to rip you off.

There are too many thing to mention on what I would check to find the problem(s).
But the yellow flame will only clog the heat exchanger up with soot - very quickly

 

[ShaunCorbs]

I would get another gas safe engy to give it the once over something doesn't sound right

 

[jtsplumbing]

Spent way to much money repairing this unit ! would have been better to upgrade to a new heater.

 

[woodsy]

Obsolete heater which were good in their day but sounds to me like it's time to bite the bullet and invest in a new one as your gonna end up throwing money at it

 

[townfanjon]

Do not use it !!

 

[theraspberryone]

Thank you everybody for your replies.
I did originally want a new water heater but apparently there wasn't one that would fit in the space, and it would have cost thousands to re-site a new one. The plumber said it was the cheapest option so I opted for new innards as there was no way I could afford the alternative. So a combined effort really!
I was thinking I should get a second opinion so, on your advice, I will definitely do that.
Many thanks again for all your replies. Very helpful.

 

[theraspberryone]

Just a thought, I don't suppose there is anybody in southend on sea on the forum who would be willing to have a look at it is there?
Thanks,