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There was an error processing your request please contact your branch for help. With a new energy efficient boiler? Need some advice on which boiler type is right for your home, try our. How do i use drain out bathroom in a regular bathtub, sink or shower drain? Pour a small amount of bicarb down an affected drain note: the drain should be clear of water when you do this, as the bicarb will just dissolve in standing water. According to the supplier, the boilers.