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Since my gas meter box is a buried in the ground type I think the copper pipe to the house would be a be too close to ground level not to bond it. A meter box half way up the wall would be different but one on the floor might fill up with water in extreme circumstances. You're right about the...

Useful to know. My vertical pipe up the inside wall will be on a dot and dab wall so will have a solid dab from floor to ceiling. Pipe surround will vent to floor void. But is there anything in gas regs to say bonding has to be visible?

Gas network use plastic which goes to meter box. Gas supplier (them who send the bills) fits meter to plastic pipe end (maybe copper there?). Your fitter runs pipe from meter into house for boiler, hob, fire etc.. That last run is most certainly in copper AFAIK.

According to onsite guide the wording is "All main bonding connections are to be applied to the consumer's side of any meter, main stop valve or insulating insert and, where practicable, within 600mm of meter outlet union or point of entry into the building if the meter is external" So since...

Are the corgi regs different to IET regs on gas pipe bonding? IET says as pipe comes in to building and where practical within 600mm. No mention of visible. In the house I'm building I was planning to have the meter box as in the ground type at the front. Gas pipe comes in and up the wall to...

FYI I have a aqualisa colt installed. I was told this was similar in performance to aqualisa opto thermo (discontinued). My cold water tank is on the ceiling joists so the head is: 54 cm Shower head to ceiling 1 cm plasterboard 7 cm ceiling joists 2 cm chipboard under tank 42 cm water...

First off why do you want to insulate between floors? If for sound then use a rockwool sound insulation product such as RWA45. Incidentally that will give heat insulation as well. But unless this is between a garage and house say you don't want to heat insulation. Why would you want to heat...

Aqualisa Colt is low pressure and is external. More a torpedo than a bar but anything low pressure has to be big.

The americans have a problem we in uk don't though. They can have air conditioning in the summer and heating in the winter. In uk the vapour barrier goes to the inside. Warm air holds more moisture so what you want to control is warm air leaking out since as it gets colder it will then...

On the HW front you want to look at the cylinder figures. These will give the kWh loss per day. I would imagine that as HW cylinders get bigger there is little extra loss compare to the loss for 2 cylinders so you then need to consider how often you have guests. And the other issue is how...

Which system? What sort of cost?

Zones allow you to selectively heat some parts and not others. All CH+HW systems will have 1 "zone" valve if you like so you can have HW without having to have CH (e.g. in summer). Do you want to only run parts of CH? Remembering that if you say don't heat upstairs then downstairs will be...

IMO there are a few possible problems. Raising the height will increase the pressure but how high is it now and how high can you make? Each meter is 0.1 bar so if you are only moving it up say 0.3 then it might not be worth it. Secondly is the loft tank running dry or low when you have the...

Are the radiators hot upstairs and cooler downstairs? I'm guessing that these are new rads on an old system. Was the system ever balanced after the new rads were installed? My guess would be that all the flow, or at least more than the loft's fair share of CH water is going to the new rads...

20kW for 1 hour is 20,000 x 60 x60 = 72 MJ (Watts x seconds_in_1hr) Water specific heat capacity is 4181 J/kgC (1l water = 1kg) So 1 liter raised by 14C is 4181 x 14 = 58.534 kJ 72MJ / 58.534 kJ = 1230 l So yes 1220 l is about right. I would guess that is you are on the _ . _ . then that...

When you say the lock out does not light up why do you think the boiler is at fault? Are you sure that the CH pump is running and running at the right speed? I've had what might be a similar problem. Boiler wasn't running, power light was on, lockout light off, no response to pressing reset...

OK. If you are lucky and have your boiler set not to the ideal set point and maximum efficiency then you might get condensation mode to occur at 60C rather than 55C. Happy?

You can get waterless traps. Screwfix have then for £21, and you'll also need 2 32mm to 22mm converters Update: Or maybe this would suit better

Maybe you could provide a link. I accept that the dew point varies with the amount of water vapour in the flue gas and that's same thing as saying CO2 since the CO2 and the water both come from the oil burnt. But if you have set up the oil boiler for maximum efficiency then the amount of CO2...

55C is the accepted maximum return temperature for condensing to occur. See here or google it.