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My mother has a Janus 3/3/30 which she uses for hot water only. Today her hot water cylinder ran dry because her wc was overflowing . Wc since fixed. Since then the pilot light has gone out on the Janus, is that a safety feature because of no hot water, didn't have time to sort it this...

Good point DP but then none of the other installers that I have had round even mentioned doing a pressure check before installing the new boiler so I presumed they did it during or after installation.

Had a chap round last week to give me a quote for replacement boiler. He phoned me today to ask if can come and test gas pressure to make sure that it's at least 18 before he can give quote. He says there is some kind of test facility within the old boiler ( gloworm space saver 38) that can be...

I got my Siamp flush valve from toiletspares.co.uk, next day delivery, I have seen the inlet valve on the site as well, think it comes in 3/8 inch or 1/2 feed

Wise words OBND, but I was trying to avoid a new pipe run. 12 mtres from meter just outside front door to kitchen where the 15mm boiler pipe and the one in the picture are located.

Assuming that it's 3/4 inch I presume that it could be used to replace a 15mm feed into a 12kw new boiler, the diameter would be slightly less than 22mm but should be ok?

Ok DP, I get your drift

I'm confused Muggles earlier u say that MI which I assume isn't copper is OD and in your last post u say imperial is ID,?

Thanks Muggles but what is male iron? Am I right in thinking that 22mm copper is measured as inside diameter?

Thanks Jim, what is MI and od?

And to think I'm responsible for all this

I would have to check again but I think it was about 27.5mm, think it was cooker pipe, but i think in those days u could get a gas fridge?

What is 20 OD. Outer diameter?

May not be easy to tell from these pics but any ideas 1/2 or 3/4. Old gas spur in kitchen about 40 yrs old, presume not copper, does anyone know the circumference of 3/4 inch? Thanks

Ok, I know that I'm no expert but could the ideal system be ,. A system boiler with a vented cylinder and aqualisa shower with built in booster pump, obviously not power shower. I know that's not ideal to combi lovers

Another reason for not having a combi, I know I may also have to upgrade my existing gas pipe for a 12kw system boiler but perhaps less likely. Thanks Bernard

Thanks Bernard, I have a timer/programmer, so it's just a case of using that to allow the thermostat to turn the boiler on/off

Thanks Vulcan , interesting points, The cylinder stat on my vented cylinder has never worked, we just turn the boiler on about 3 times a day to heat a tank of water which works fine. If I get a new cylinder stat when I get a new boiler will the boiler keep firing up when temp of water drops?

And the hot water cylinder is staying vented

Thanks Bernard, I still wonder why installers tend to pressure me into a combi boiler when it must be easier to install a system boiler from a vented system