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How do you balance a system :?: :?:

Have just added 4 radiators in basement on to existing Ravenheat Boiler 100,000 btu's. Everything ok except on last radiator which is hot on flow, rad. warms up but return pipe stays cold. If i turn off other Rads it then heats up ok. and return pipe flows hot :?: :?:

Fitting shower tray on existing moisture proof weyrock. Would fitting a piece of additional weyrock same sixe as tray suffice or should i cut out size of tray and fit 20mm. marine ply in place. Trouble with fitting marine ply is the amount of work involved in strengthening original floor as the...

Installing a complete new bathroom in a different room. Is it ok to tee into one 32/40mm. waste pipe a shower, bidet, washbasin and bath and then out into existing soil pipe?? :? :?