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use the proper pipe sizing calculators 1m meter of 15mm copper pipe is 0.49 its self 15MM elbow is classed as 0.4 of a metre so x 2 that is 0.8 of a meter so another 0.3947 So your calcs are well out Then possible allowance for the tee The figures of the logic plus 30 is 3.135m3 /33.733kw...

33 .7 kw gross on 1 metre 15mm with two 15mm elbows is a drop of 0.8881 before allowing for how may exit the tee which could possibly take it well over

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but it tends to block in the actual manifolds which larger pipework doesnt have

Cheaper and in theory easier to fit but not really . Microbore used to be 8mm copper but now you get 10mm copper and plastic with 8mm rarely being used

the left hand blue one push it back it maybe pretty stiff and need pliers on it gently .

They will prob cover it over with donkey dick ........that is the term the guys use for the stuff they use if you see them doing it you will understand

From the book . Pipework suitable for gas used in an inappropriate location and/or situation: Situation 1. installation pipework ........... im not putting it as doesnt apply here situation 2 service/service pipework. For situation 2 regarding service/service pipework, see Gas Safe...

Give SGN a call and the will come out try and move the sleeve if no play then they should wrap the the exposed pipe

yeah just that bit

if its still under warranty then ideal may refuse to work on it as the pipework allowing for the tee will just be undersized but nothing that will really effect it . But if everything is accessible at present then get it changed to 22mm to future proof it so no one can say its not adequate...

How much are they charging ... around a grand ?

You paid someone to do a job so why not phone them back up and say it appears not to be successful and needs a revisit . It may well be your plastic piping is the non barrier type with your repeated blockages

How far out from the brick work does that concrete section stick out ? The pipe does go tight to the wall for entering into bottom of box . Be easier just cutting a channel into the concrete for pipe to sit in it and as they are digging a hole a couple of foot deep they should be able to chop...

nope doesnt make any sense to me either . Take it box is semi concealed and being sunk into the ground ?

no it will just empty the pipework but if it snaps in off the position you then have 25 + gallons of water stuck above it with the additional hassle of changing that valve which in some instances is not straight forward

which as all pro`s know have a habit of snapping in the off position causing the diyer more problems and for the sake of a few pennies worth of pre heated water not worth any possible hassle

Nope you will still have the head of water just turn cold off and run the water till taps stop running

which they usually are ;)

its not going to do any harm trying it