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Thanks PrenticeBoyofDerry, thanks for explaining what m.i meant, now the quote makes perfect sense and I know I must use 4mm². Re the sockets, there's only the one circuit, I just split it in two for the calcs as I would wire it in singles, and the earth is a smaller gauge than the L and N...

I'm planning to put some sockets and new 2 way lighting circuit in my garage, all in surface mounted conduit, I also need to run a earth bond from the CU to the gas pipe entry to the house, the gas is 6 m along the planned conduit run. The new sockets will be a new circuit fed directly from...

Anyone?

Vaillant 428 - Min flow required approx 20 litres/min (0.33 litres/sec or 1200kg/h) Pump Grundfoss Selectric 15/50 (set at III) - Pump curve here: http://www.plumbnation.co.uk/site/grundfos-ups-15-50-selectric-130-bare-pump/Grundfos%20UPS%20Selectric%20Pumps%20Brochure.pdf ABV Honeywell...

Flow temp set at 70. I can live with that, as the weather gets colder and we're running the heating at the same time as hot water, I can knock it down a bit and recharge times shouldn't be effected too much as there's less cycling when there's a higher circuit heat loss (ie via the rads).

More great info, the installer came back yesterday to upgrade the programmer from 1 day to 7 day, he also adjusted the pressure relief valve, the balancing valve on the hot water circuit (increased the resistance) and the anti-cycle timer. Since all are changed, System appears to be behaving...

In physical appearance it looks exactly like this one: http://www.screwfix.com/prods/34127/Plumbing/Central-Heating-Controls/Honeywell-Straight-Auto-Bypass-Valve-22mm I don't know if there are several different models that look exactly the same, but if not, it's defintely that one.

Via observation, that's the conclusion I had come to, I'm glad someone else believes that's the case. It's partly the cause of the problem we are having, I'm sure of it. Because the heat is not dispersed quickly enough into the cylinder, partly because of the short circuit and partly because of...

To answer your questions (and other people's)... Pump is Grundfoss Selectric 15/50, originally set at 3, now set at three as lowering it made no perceivable difference to time taken to reach temp / rad performance / frequency of boiler firing but means the system runs much quieter. Bypass...

Selectric 15/50 rings a bell, no idea why it would other than if I'd read the name and numbers before so I think that's what it is. Bypass valve I'll have to check later. It has a red plastic cap that screws on over the top of the valve adjustment part if that helps. We've not had the...

Pump is Grundfoss and is red, I don't know the spec without looking at the info panel on it. Yes there is a bypass valve. There is a single mid-pos valve (system is Y-Plan).

In the interests of establishing whether it's likely to be a limitation of the cylinder causing the problem, I attach a couple of pics to possibly identify the age / type. The pic of the immersion heater head is included with the assumption that it's the same age as the cylinder, it may of...

Well that calculator gives 17kw as the size required, but doesn't take into account having an unheated garage underneath two bedrooms, old double glazing etc. So that seems to backup the sizing choices of both boiler and rads. I'm not sold on the restricted pipework theory, I'm no expert, but...

Sum of rad max outputs, plus 3 for hot water cylinder.

Thanks, good answers. The insulation on the cylinder is green-ish I think, the only remnant of the label says 'grade 3'. Only one fitter asked if we wanted to replace the cylinder, we said we didn't as money is tight. The other two quoters didn't even ask, just assumed we'd keep it. You...

Cyclinder is not 'red jacketed', it is factory insulated, but I've no idea of age, it came with the house so could be anything from 2 years old to ancient. One point of note (I think it may be at least having done a little more reading) that I haven't mentioned is that the old cylinder was...

Max heat demand is circa 15kw, with a planned extension though that would take it to 19/20, the 418 would be too close to the mark in future and there's no Vaillant in-between. Installer 'ranged' to 20 and (with his agreement) I have experimented with lower values. The 'sounds like'...