Payback time on new boilers

[Dave Plowman (News)]

IMM only quotes maker's specs without any understanding of how they are arrived at. And doesn't understand economics either. In other words, an ad man's dream customer.

[IMM]

< snip drivel >

[raden]

In message , IMM writes

Snip DIMM - ha ha Darwinism at work

[Andy Hall]

It's actually worse than that. The quotes are from marketing information presented to look like a spec. but having more than a smidgeon of poetic licence.

[IMM]

Maxie, have you been doing things to Dim Lin the Oriental Enchantress?

[IMM]

How do you know? You are making things up again.

[Dave Plowman (News)]

I'm waiting for someone on here to say they've had a 40% reduction in their heating bills when changing to a condensing boiler.

Out of the dozen or so I know of personally, the *best* is 25%.

The worst - which was a reasonably well controlled system with a Potterton Neataheat managed under 10%. And is unlikely to ever pay back the capital cost given the poor likely life of many modern boilers.

[Andy Hall]

I don't have difficulty spotting phonies and misleading information.

Figures presented outside the format of a formalised data table, and even some in one, should always questions about what is left unsaid.

[Andy Hall]

I get between 25 and 28% with everything normalised as much as possible, but that was relative to a 65% lightweight one and controls were also improved.

[Dave Plowman (News)]

I'd expect you to get near the maximum given your understanding of correct controls.

My point is few would have put up with a basic open flue system with no controls and suddenly change to a sophisticated modern one - unless moving house. In which case they wouldn't have accurate figures for the old system.

[IMM]

[Ed Sirett]

I got c. 30%, and also a customer, however the 'before' in both cases was an open flue, permanent pilot, cast iron unit (Concord or G/W BBU). No control of HW and a cylinder with a tatty jacket.