I have a 30-40 yo oil fired boiler with forced hot water base board heat. the hot water tank is inside the boiler,which the boiler runs year round when the call for hot water is needed.I have installed a gas fired hot water tank to have plenty of hot water and not have my boiler running constantlly.the problem is the boiler is still calling for the old tank to provide the hot water.how do I stop this boiler from running,is there a wire I can disconnect or what... boiler is a burnham jubilee