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OK so I will have radiators in the rooms for a more reactive source of heating, controlled by one Vaillant Vsmart controlled vaillant combi boiler, the thermostat will be in the common hall area. I have an additional Vaillant system boiler controlled by another Vsmart, somehow I need to...

one you should keep the extra low voltage control away from 230 volt AC Is that because the ELV control is carrying a 'signal', and the 230 a 'current' ... the current interfering with the signal ... note: this is a wet system, not electric heat matt. So 2x 0.75mm² 3 core would be advised, I...

But if it's a water pipe and there's any water in it you'll struggle I knocked up a wet vac contraption to suck out any water - which helps greatly, you know your in trouble when you hear water boiling inside the pipe.

Seems convention is to fit min 1.0mm² 5 core for a wired room thermostat, will 0.75mm² suffice, as thats all that seems available from my local Toolstation and Screwfix.

A typical DIY/newbie mistake is having the torch blasting away, especially if using MAP gas. It's not needed Any idea how much hotter MAP gas is, I've changed back to ordinary blue bottled gas (is it propane ?), don't notice that it takes that much longer to heat a joint to be honest.

Don't apply heat to the fitting Or I presume, not try to put anymore solder in the joint ... simply heat, move, heat off. Presume cleaning the area and wiping flux around prior to heating wont hurt. Does burn't solders surface take on a particular characteristic so you know when that has...

You can burn solder. Interesting to know that can happen, presume that happens where you leave the flame on too long ? tricky business trying to apply an even heat some times, especially in cramped spaces, and you have to rely on heating the front only and wait for the heat to get to the the...

the issue is when it's over heated and starts to bubble. I'm using MAP gas, but must admit I don't recall ever seeing it bubble - what sort of torch would make Solder do that, but in essence - where that does happen, your suggesting that can over cook solder then ?

Yes thats all I'm looking to do, thanks, I guess as long as the solder on the 22mm ends doesn't reach melting point - then ther integrity of the joint should be good then.

I have a 22mm to 22mm to 15mm end feed Tee. I want to rotate the 15mm pipe, which has a close fitting elbow connected. The 22mm connections will remain untouched. I can't see how I can localise the heat to just the 15mm connection, and I suspect the 22mm's will get hot and the solder...

Johnny oh Johnny. Leaving restricted voids around gas pipes is exactly the the way an explosion happens in a house The pipe sits in a chase little bigger than the 22mm copper pipe, with DPM wrapped around, originally the gap around the pipe was to be filled with Dot and Dab adhesive (the wall...

Interestingly, this thread has been posted today Ummm just what you said. Traps are usually polypropylene for that reason. Its good to know this stuff. muPVC not heard of the 'm' ?, the 'u' is unplasticised. Whilst we are on plastics, expanding foam in contact with T&E wirings insulation...

This scraped article: https://www.servicethread.com/blog/the-uv-resistance-of-polypropylene-and-polyester-explained states: This makes polypropylene unsuitable for uses that require longterm exposure to sunlight. So why use polypropene over PVC, I know Thames Water insist on clay still because...

Push fit can fade badly though if external. Is the solvent weld soil made from different plastic ?, I've not used solvent weld soil, sure I couldn't find much difference between that and push fit in the price. Agreed, no difference for solvent weld. If no difference then I'm surprised they...

This thread seemed to suggest that there was no difference.: https://www.diynot.com/diy/threads/what-is-difference-between-white-and-grey-40mm-waste-pipe.256885/ One suggested white was for interior use. But like soil pipe types, is the grey not UV stable ? in my experience though and after 15...

Sorting out the system logic sounds good, I tried that at the weekend on peices of paper drawing out the circuits, but I just ran aground, are there any templates to help with this sort of stuff. The rooms will mostly be vacant during work days, but need to be up to temperature by 6.30pm. I...

My understanding is that any void containing a gas pipe needs to be ventilated, however small voids in ducts of less than 0.01m² and 0.01³ do not require ventilation. My use of the word sleeve might mislead, the DPM is wrapped around the pipe and was there to protect the copper from corrosion...

A 130mm thick internal block wall,, in a kitchen has a shallow vertical chase - about 1.5mt, into which 22mm copper pipe has been placed. There are no joins in this length of pipe. This will sit behind a kitchen cabinet 715mm, and then beneath 500mm of tiling. The surface of the copper pipe is...

Hi, I am having the same dilema, did you find a solution ?

So its acting like an old fashioned storage heater ... I can see that controlling with a simple on/off thermo stat is going to be difficult. I see terms like 'adaptive' and 'optimum start' etc quoted for UFH controllers, as well as temperature probes that from what I can gauge go into the floor...