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I thought out of politeness and gratitude to all contributers, that I'd close this out and to perhaps assist others who happen upon this issue. For the past 4 days, the boiler hasn't locked out in overheat, and I've no idea why its stopped doing it. In addition to all the options tried, I...

All interesting opinions. I've been swayed back to a heat only conventional boiler. And this one with 10 year warranty has plopped up to the top of my list; https://www.wolseley.co.uk/product/worcester-bosch-greenstar-ri-30-heat-only-boiler-pack/

Hmm, all interesting points. Could I therefore ask for recommendations for; A; A conventional/standard floor standing boiler - direct replace or; B; A combi boiler, wall mounted for a large 4 bedroom house,mshowervand bath

Great idea, but incorrect im afraid. You must submit an accurate system drawing with all applications, along with instructions to tenants on how to disinfect any outlets.

Yes, but not the CW storage tank which supplies the bathroom taps....

Thanks for all the opinions. I guess there are many pros and cons either way. Of course the benefit of being able to havev an immerser as back up is great, however, the downside of having a tank system is the increased risk of legionella, and particularly in SNP run Scotland where you now need...

Existing shower, bathroom taps and cisterns are all fine. And ok for mains. Anyway, I'm really looking for boiler recommendations.

Twin pump power shower. Fed from the hw cylinder and storage tank.

So far three suppliers have recommended it and the output, mainly because I have an existing power shower - the existing boiler is free standing and in a cupboard, very difficult to work on and replace. I also like the idea of fresh water in the upstairs taps and getting rid of the HW tank etc...

Ok, so I've given up on my horrible Potterton boiler & going to get a combi of sufficient capacity for a 4 bedroom house (bath & shower). I can probably get it into the built in garage which is right next to the utility room where the existing boiler is. Looking for advice on best wall mounted...

Might be able to convert to wall mounted, but space in the utility room is very limited.

Thanks for all comments. It looks like I'll need to replace. I would appreciate any recommendations for a new FS system boiler. Or top 3 recommendations. Thanks

Thanks, yes it modulates down to a steady "burn", and seems to operate ok until it reaches the 20 minute mark, then locks out. Both flow and return pipes (the ones I can get too) are both very hot, after its been running a while both feel about the same temperature. I also called Baxi to pay...

If anyone has any ideas on this problem, I'd really appreciate it. Thanks.

So an update: New pump and isolation valves fitted, system refilled with inhibitor, and by-pass has been set at 0.2. System bled and everything fine. However... Right on the 20 minute mark, the boiler locks out in over-heat, which takes around 30 minutes to reset. Guys have written down...

The valves have (chewed) screwdriver slots, and one is seized tight. New valves & pump have just been fitted and system filling up now with inhibiter. I'll update after its working again... Incidentally, the water is very clear when it was drained, plus the Magnaclean filter didn't have much...

Understood, thanks. Bit of an unfolding drama: When I was looking at the by-pass valve, I noticed one of the pump isolation valves was seeping a bit, when I looked closer, both of the isolation valves are completely seized. This got me thinking about the pump and how old it is - probably 8-9...

Ok will try that, thanks. Remember theres a radiator without a TRV fitted in the system.

Sorry my mistake, yes its a bypass valve. It looks like it's set quite high 0.5? Theres also a towel radiator without a TRV in the system too.

Yeah, there's what looks like a pressure relief valve?