Hot water heating system having auxiliary pressurizing means

Claim 1

IN A CLOSED HOT LIQUID HEATING SYSTEM HAVING A BOILER AND HEAT RADIATION MEANS CONNECTED BETWEEN THE SUPPLY AND RETURN LINES TO SAID BOILER, INCLUDING MEANS FOR CIRCULATING LIQUID THROUGH SAID HEAT RADIATION MEANS, AN AUXILIARY PRESSURIZING VESSEL CONNECTED TO SAID SYSTEM AND ADAPTED TO RECEIVE A QUISCENT QUANTITY OF HEATING LIQUID WHICH CHANGES IN AMOUNT ACCORDING TO THE EXPANSION OR CONTRACTION OF HEATING LIQUID IN THE SYSTEM, THE IMPROVEMENT IN SAID SYSTEM WHICH COMPRISES AN AUXILIARY BOILER INCLUDING A SUPPLY CONNECTION BETWEEN SAID AUXILIARY BOILER AND SAID AUXILIARY VESSEL FOR HEATING LIQUID, SAID AUXILIARY BOILER BEING MUCH SMALLER THAN SAID AUXILIARY PRESSURIZING VESSEL, A VAPOR CONNECTION BETWEEN SAID AUXILIARY BOILER AND THE VAPOR SPACE IN SAID AUXILIARY VESSEL ABOVE THE LEVEL OF LIQUID CONTAINED THEREIN MEANS FOR APPLYING HEAT TO SAID AUXILIARY BOILER INCLUDING MEANS RESPONSIVE TO THE PRESSURE IN SAID AUXILIARLY VESSEL FOR REGULATING SAID HEAT APPLYING MEANS, A PUMP IN SAID SUPPLY CONNECTION BETWEEN SAID AUXILIARY BOILER AND SAID AUXILLARY VESSEL, AND MEANS RESPONSIVE TO THE QUANTITY OF LIQUID IN SAID AUXILIARY BOILER FOR CONTROLLING THE OPERATION OF SAID LAST NAMED PUMP.