How can homeowners conserve water? The best and worst double glazing firms, as voted for by thousands of which? members. It goes without saying that if you try all of this and nothing works, you may need to call a plumber but why not try it yourself first? The pool heat exchanger will also require a warmer temperature than the discharge temperature to the pool assuming that we have a °f discharge temperature, our boiler water must be higher than that and it may be to degrees.