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What courses could a plumber do that wanted to go in to system design of plumbing and heating systems?

Does plastic hep20 pipe freeze ok with an electric pipe freezer? Have only used it on copper before.

Got a pressure relief dripping on an internal bubble hot water cylinder. To recharge the bubble it's close the cold fill to cylinder. Open a hot tap and run till it stops and open pressure relief and refill?

These two immersions have no power going to them, I was going to look at changing the fuse first then the possibly the stat I no it's not a great set up but it's a temporary measure until the house gets converted to a combi boiler.

Have a couple of rusty rads to swap on a system. Like for like same side. Would you swap the valves and drain down. Or leave the valves so don't have to drain down?

I'll have to work out the rooms heat loss. But is it likely 2 tower column radiators would heat this room. If swapped out the normal radiators

Haven't fit a toilet with a flapper valve for a flush before. Do they come with a spring onion the handle that keeps the flapper open?

Any plumbers done this recently? I am doing it soon. Just wondering if anyone has any tips. Thanks

What's the usual cause of the pressure relief discharging on a Triton shower. The pressure on the system is only 3 bar. Thanks

I have a kitchen sink waste that is blocked after the trap somewhere under the floor the waste is inaccessible. Is sulphuric acid the best drain cleaner for this. The pipe is all plastic that I can see. I think I spoke to someone who said there was two grads of it? Thanks

Is 95mm x 95mm not a standard size for a light switch just looking most appear to be 85x85. Also I'm after this size in a dimmer but most say that there 2 way switches. There is only one switch to turn the light on and off so I need I'm correct in saying I need a one way switch? Thank

Can you use an electrical freezing kit on mdpe pipe? I know a squeeze off it is an option. Strangely I have a electrial freezer but not a squeeze off kit

I have a concealed shower that is banging when on both the big shower head and the small shower head in the riser any ideas? Divertor valve?

Are these serviceable at all? Have one that won't turn off. Thanks. Its possibly be over turned and spinning though it's presently in. Not seen the valve yet.

I haven't been to the boiler yet. But in correct in saying E1 is a low pressure fault. Do the pressure sensors ever block up on these often? Also does anyone no what the main HEX is made of on the boilers?

Has anyone had a radiator powered coated before? So you can have it a specific colour.

Does anyone one use a combined isolation and DCV for an outside tap installation. Instead of and isolation and separate DCV. Thanks

To do this say between two elbows do you measure between were the thread ends internally on both elbows?

If fitting a secondary return on a cylinder that has a secondary return connection. I understand you just need to fit a pump pointing back to the cylinder? No check valve is needed like when you tee it in to the cold connection? Someone implied to me you needed one when going in to the...

I have some rads to swap on a vented system and know they can be a pain refilling. It was originally going to be one rad so I was looking at freezing it to alter the pipework. I have and electrical freezer. But it's going to be 2 rads now. Both rads down stairs. Would you entertain freezing or...