Hole in boiler - fix?

Author
Discussion

ST12AT

375 posts

127 months

Tuesday 27th October
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Oversized boilers that cannot ‘get rid’ of the heat do not cope very well.

A 30kW boiler attached to a 12kW system will constantly short cycle and be subject to higher temperature deltas.

Much older cast iron boilers didn’t suffer as badly being oversized because of their construction but modern boilers are delicate in comparison.

KAgantua

2,072 posts

91 months

Tuesday 27th October
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TBH Bosch are st these days. Mums dishwasher broke down just over two years since new. Nearly £400 quid worth of DW. Currently battling retailer.

Shame they seem to be the 'go to boiler' but I dont think they are what they were

MellowshipSlinky

Original Poster:

12,083 posts

149 months

Tuesday 27th October
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Our last Worcester boiler (a very large inefficient floor standing one) was well over 25 years old before we changed it.

Sheepshanks

21,987 posts

79 months

Tuesday 27th October
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ST12AT said:
Oversized boilers that cannot ‘get rid’ of the heat do not cope very well.

A 30kW boiler attached to a 12kW system will constantly short cycle and be subject to higher temperature deltas.

Much older cast iron boilers didn’t suffer as badly being oversized because of their construction but modern boilers are delicate in comparison.
Is that specific to oil, and is it because they don't modulate down?

30kW is pretty entry level for a gas combi.

ST12AT

375 posts

127 months

Tuesday 27th October
quotequote all
Sheepshanks said:
Is that specific to oil, and is it because they don't modulate down?

30kW is pretty entry level for a gas combi.
It applies to all boilers.

The lack of modulation or range rating on oil combi boilers makes them the worst of the lot. I detest oil combi boilers, they always end up leaking.

If it’s impossible to fit a separate cylinder along the oil boiler (which it’s claimed it is but never is) then a buffer vessel would help, although if there is space for a buffer vessel then there is space for a cylinder plus oil combi boilers are expensive!

sparkythecat

7,331 posts

215 months

Wednesday 28th October
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MellowshipSlinky said:
Our last Worcester boiler (a very large inefficient floor standing one) was well over 25 years old before we changed it.
So was ours. I replaced it 2 years ago when the waterj jacket started leaking. I chose a modern Worcester Bosch boiler, which is no lightweight. It weighs in a fairly hefty 270kg.
I was rather hoping this one would last a similar length of time.

Edited by sparkythecat on Wednesday 28th October 14:29