Maybe would be nice to do as a graph showing where various developments branched off e.g. lightweight heat exchangers from cast iron, combis from heating-only etc?
--John Stumbles 13:57, 21 February 2007 (GMT)
Anybody know when building regs changed obliging non-permanent pilot light designs? --John Stumbles 16:31, 21 February 2007 (GMT)
Somewhere before the 1/4/2005 upgrade to Part L. It must have been the inspriation for the retro fitting of electronic ignition to models like the Kingfisher and Mexico. --Makewrite 20:20, 21 February 2007 (GMT)
A long time before 1/4/2005! I'm guessing around 20 years ago but it'd be nice to know exactly when.
Were there 'electronic' versions of the Mexico & Kingfisher? (My Ideal manuals are up in the attic and I cba to dig them out right now.) I haven't come across many Kingfishers but all the Mexicos I know are permanent-pilot-light types. --John Stumbles 00:11, 22 February 2007 (GMT)
The ones I'm thinking about were only sold in the few years before 2005 and often sported an 'L' at the end of the model number. In many cases e.g. Profiles no change was needed so the Profile 80e became the Profile 80eL.
They were intended to be direct replacements for the original dinosaur types but some lost the thermocouple.
ISTR that a few of the back boilers suddenly got electronic ignition also. --Makewrite 17:39, 22 February 2007 (GMT)
So wasn't there a change of regs that prompted the move from permanent pilot lights? Did it just happen sort of spontaneously? --John Stumbles 21:16, 22 February 2007 (GMT)
I think there must have been as the 'L' at the end probably referred to Part-L of the B.Regs. This change was prior to 2005 but not decades before, There may have been other changes much earlier to cause the introduction of fanned flues. However competition from continental designs and the advantages of more versatile flues might have brought this about without a regs change. --Makewrite 06:09, 27 February 2007 (GMT)
I think the natural draught flue variants were always available it was just the proportion of installations that shifted away from using a chimney. --Makewrite 20:22, 21 February 2007 (GMT)
I guessed that RS must have come along later and that something like a Pott C70/21 must have been a purely OF design. Likewise Bermudas (were there ever RS versions?) --John Stumbles 00:11, 22 February 2007 (GMT)
I've never seen a RS'd BBU the flueing would be nearly impossible.
I was thinking of installation to outside walls like RS gas fires, though a BBU would obviously need a fairly deep fireplace against the wall to hide it in which would really make it only suitable for (then-) new-build. --John Stumbles 21:16, 22 February 2007 (GMT)
The Pott. Netaheat was unique in using a heat sensing mecury vapour phial to detect the pilot light. The are many models which have a two stage ignition with a pilot and main gas valve. --Makewrite 20:38, 21 February 2007 (GMT)
Ahh yes: Wait ...... clunk! I still come across a few of those. --John Stumbles 00:11, 22 February 2007 (GMT) Solid kit.
I've looked for Potty's latest offering I could not find an installation PDF for the Promax but the specification looks like it a grown up condensing unit. It has low NOx and deep modulation >3:1. These strongly hint that it has a premix burner. A tight inlet pressure spec and no burner pressure spec also suggest this. ... ... OK I found the manual it _is_ a one piece premixing unit but it is also _upfiring_ (another one to avoid fitting).
--Makewrite 17:39, 22 February 2007 (GMT)
I had an idea there was one called an HE 30. Baxi were also showing both a new generation and ye olde two-heat-exchanger offerings (with some pure weasel spin on why that was a good feature!) at a trade show at the local footy stadium last year. I didn't pay much attention as I was in a hurry to get to the Worcester and Vaillant stands :-) --John Stumbles 21:16, 22 February 2007 (GMT)
I've checked Poxi's offerings and they have an odd mix of contemporary designs with side-blown combustion chambers, and some that look like the missing link between secondary heat exchanger types and single hx types: they have a single hx but it's a cuboid box with an upward-firing burner.
--John Stumbles 22:13, 26 February 2007 (GMT)