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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.

Oil was always more efficient than gas so gas gains much more by condensing. But the problem with oil is that it smells. That's not a problem with a flue gas of 180C as the smells are up and away, just the pigeons go what a whiff :). Condensing oil is a lot colder flue gas and you get plumes...

You will probably need to use converts to change 22mm to 32mm and back so you can have a trap. I guess they might make a 22mm trap but getting one is another matter. Alternately why not just make the 22mm loop down and back to make a running trap yourself? 75mm should be enough. Or you could...

Hi, I'm looking for a whirlpool bath. One I'm considering is in plumbase, Bronte Easy Bergamot Whirlpool, 1800x800. But finding one to look at seems to be impossible, unless anyone knows of store with one on display? Anyone got one? I've also looked at the Bathstore wash which is cheaper...

H allows opposite branches if they are swept which a branch fitting is so I reckon that is compliant. With soil pipes there is the danger with too much slope of leaving the solids behind, hence the rule of thumb I believe of 1:40 for 4in pipe, 1:60 for a 6in.

This isn't the dry part of the stack. Basically I have 2 soil pipes exiting a wall at the same level with the stack in between them. I could use a double 87.5 deg branch so both pipes have a -2.5 deg angle. Or I could use a 67.5 deg with a a 87.5 deg on top. One pipe would have -2.5deg angle...

Building regs H 2015 says WC branch pipe can have a slope of 18-90mm/m (page 9) which works out as ~1 deg to ~5 deg. Floplast, for example, do stack connections at 87.5 deg (-2.5deg) and 67.5 deg (-22.5) and 45 (-45 deg). Only the first of those meets the regs H so what am I missing? Or can I...