Replace boiler heat exchanger while off for other work?

Question

My Worcester Bosch 28cdi has developed a water leak and I've traced it to one of the push fit pipes going into the plate heat exchanger (the pipe with the temp sensor attached).

Although I could probably replace the o ring myself, the wife insists I call out our normal heating guy to do the job. The heat exchanger will have to be removed to replace the o ring and as the boiler is just over

10 years old, would it be prudent to replace the heat exchanger while its off, rather than have it fail within the year and have to pay the heating guy's labour charges again? With 10 years use, is the heat exchanger likely to fail soonish? A new heat exchanger will cost £90-£100.

Cheers,

newshound · Accepted Answer

You mean the DHW heat exchanger? After 10 years I would say it is worth the £100 punt on top of your callout/service costs.

I had a couple of combis which didn't make 10 years each, they both had problems with DHW heat eachangers and control boards, but the primary heat exchangers (the ones in the gas flame) didn't have any obvious problems.

Paul Giverin · Answer

Thanks. I spoke to a work colleague who used to be a corgi heating  engineeer and he agreed that it would be best to change it while its out.

Stuart Noble · Answer

Took the WB engineer best part of 2 hours to get our HE out, a well  known bitch of a job apparently. The WB all inclusive charge proved to  be the way to go on that occasion.

Paul Giverin · Answer

Was it the 28 CDi? Perhaps it was the gas to water heat exchanger because on this model, the DHW water to water heat exchanger is very accessible and easy to change. Two push fit pipes, one secured with a clip and one traditional threaded union.

Replace boiler heat exchanger while off for other work?

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