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Softus daughter? Agile?

On basis you have a mid poistion valve, I have already answered this above.

Simond, thanks for the interesting reply, most of which I agree with. I do not, however, understand the term "partially" condensing as in absolute terms, a gas has either condensed or it has not. I am not a supporter of Govt. Stats in any way, shape or form but your analogy to Fuel...

Sounds like being a little bit pregnant!! In point of fact, the Kidd uses a second heat exchanger above the first to capture heat that would otherwise be lost up its flue and crucially descibe their boilers as "condensing". The fact they do not require SS flues simply means that the flue gas...

Well, yes and no. Yes for the size of Mat's system under discussion. No in the sense that collector area could be added specifically for CH provided a thermal heat store of appropriate size was fitted to match eg collector area 10/15m2 with THS of 1,000 litres. I believe that Mat's solar system...

Oilman, I don't think you are quiite correct. Honeywell's mid position 3 port (V4073) does not automatically shut the DHW port (port B) when demand has been satisifed. In fact with no power supplied to the valve, the motor de-energises and returns under spring pressure opening port B. With power...

I could easily be wrong but you may have hit the nail on the head. Lets try this - A MID position valve has been fitted to your boiler system ie both HW and CH ports open when at rest. Thermo syphon, which requires no power whatsoever of course, then runs unobstructed from upper heat coil of...

Agile, Schott claim that the reflective coating is pure silver and that "The mirror cannot become soiled and does not age, thus maintaining a permanently high angle of reflection." Regarding the manufacturing process, I think you may be right as I recall reading that they vaporise some...

Except that the collector losses are not static eg When collector temp = Ambient temp there is Zero temp loss. That's presumably why the thermal losses are usually expressed as a % in the 5% to 10% bracket. Agree that solar power is reduced the further north we go but there is only 5.75...

Mat There are several aspects that don't make sense. 1 - The huge price paid (Chris has dealt with that) 2 - Only 2point something M2 area collector fitted but you expect that to heat your DHW and your heating???? It won't. DHW alone needs about 1m2 per 100 litres stored and 70-100 litres...

Chris, out of interest why should Scotland be a problem? Surely you would just need to increase the collector area the further north you are. Also, wouldn't evac tubes compensate for less sun in jockland or is that just slick advertising?

You won't fail BRs by NOT fitting a rad to a new extension. You can retrofit after completion and as long as you do not change the boiler (or HW cylinder I believe) there is NO trigger for a TRV. It therefore follows that there is [edit] no BR requirement in your case. If you know the rad /...

No. Reread Agile's post above "The need to upgrade controls is activated by replacing the boiler" ie not simply by adding another rad to an existing system. That said you should still give a TRV serious thought especially when the rad / towel rail is overspecified for the room irrespective of...

Could be a Frost stat / return limit stat failure or associated wiring as these should be wired independently of programmer. Hope this helps

I thought all weekends were Bank Holidays in the US Ahem, I'll get my coat

Unless I have misunderstood, you may have a solution after all - persuade your wife. The Vortex boilers (and I guess all modern oilers made for internal use) do not smell at all, not even a trace. It it does, then it has not been installed correctly. My Vortex Utility model is installed in a...

Catlane I have recently changed to a condensing oil boiler by Grant (their Vortex model) and swear by it. The heat exchanger is stainless steel and has a 5 year manufacturers guarantee out of the box - Only condition is annual service and the usual inhibitor in the system. If they were that...

The term "header" is americanese for an engine's exhaust manifold. I would therefore assume the guy is probably talking about "Flues" when translated into english. Hope this helps ps Great forum by the way