Sanden Heat Pump water tank outlet size

The outlet size on a Sanden Heat Pump’s water tank is 3/4 inch (DIN20) with a BSP thread, so be aware you’ll have to use a reducer to get down to the normal 1/2 inch (DIN15) copper pipes.

However, 3/4″ pipes are able to transport a greater volume of water per unit time. If you’re running warm water down them for bathing, rather than hot for subsequent mixing, greater carrying capacity means better water pressure when running multiple showers, for example. If one was replumbing a whole house, and doing so with pre-mixed warm water, replumbing with 3/4″ copper would be a reasonable thing to do.

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