Once you have accepted the cost, it’s time to decide which. When the tank is empty, remove the discharge pipe from the t&p (temperature & pressure) relief valve disconnect the water supply lines if you must cut them, leave them as long as possible have someone help you remove the old tank with a hand truck. Your browser does not support iframes. Joni mitchell once said this and boy is that true of your boiler! dealing with an emergency boiler repair is the worst, and it’s only when it.