Buy a 21.5mm Overflow Solvent Waste 90 Degree Tee
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The overflow pipe needs to be at least 22 mm in diameter — and plastic — typically solvent-weld fittings. Copper or steel pipework cannot be used. The pipe must also have as few bends as possible. This is in order to prevent the condensate from becoming trapped in the overflow pipe. Condensate/Overflow pipes that are out or run through an unheated outbuilding, like a garage, must be insulated lagging in order to prevent them from freezing and shouldn’t be longer. Where it’s undesirable to insulate the pipe for aesthetic reasons, 32 mm piping will significantly reduce the chance of freezing.
The up-sizing of 22 mm to 32 mm pipe should ideally be generated inside the house so that water cannot freeze in a 22 millimetre section that’s outside or inside a wall cavity. The gradient should prevent water from sitting in the pipe and freezing. Sometimes called condensate pipe – in boilers, a little siphon is comprised by the condensate trap until it warms up to a level where the siphon is triggered condensate is collected in the trap and the trap drains itself. Condensate flows through the pipe in bursts of a few hundred millilitres at one time, which may be heard trickling through the pipe. The release of small quantities of water through the pipe is preferable to a flow, as a continuous drip is more liable to freeze.