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| Number | Title | Issue Date |
| 4562956 | Domestic hot water zone valve controlled external coil A domestic hot water zone controlled external coil which takes heated water from the hot water outlet of a hydronic boiler and passes the hot water through a tankless coil before returning it to the hydronic boiler. Return water from the tankless coil is ... | 01/07/1986 |
| 4542850 | Central heating method and plant The invention relates to a method and a plant for the central heating of a building provided with at least one thermodynamic machine such as a heat pump or a refrigerating machine. The method is characterized in that, without affecting the normal operatio... | 09/24/1985 |
| 4535931 | Energy conserving water heater control system Water temperature sensors in the form of thermisters are in physical thermal contact with the inlet and outlet pipes of a water heater and may be surrounded by insulating material to make them more insensitive to the ambient air temperature and more sensi... | 08/20/1985 |
| 4529121 | Apparatus for actuating the temperature setting means of a water heater An apparatus for actuating the temperature setting means of a water heater is provided with a drive motor (2) adapted to move the temperature setting means from a low to a high temperature setting and vice versa. The drive motor (2) is connected to a powe... | 07/16/1985 |
| 4529120 | Heat generating system for multi-purpose usages and recovery of products of combustion A heat generating system using solid fuel in a water jacketed combustion chamber for supplying hot water to units for space heaters and hot water storage units, and in which control means is provided for operating the fuel combustion mode to obtain recove... | 07/16/1985 |
| 4522333 | Scheduled hot water heating based on automatically periodically adjusted historical data A conventional hot water heating system generally of the type for heating water in multiple units of hotels, motels and the like and using any heating medium has a processor and control assembly operationally connected to at least a heating control means,... | 06/11/1985 |
| 4508261 | Hot water control and management system A hot water control system for providing necessary hot water to a structure at optimum energy saving conditions includes a programmable control system for selectively programming preselected quantities of hot water at preselected time periods over a given... | 04/02/1985 |
| 4502626 | Combustion product condensing water heater In a water heating system, vapor in the products of combustion gases is condensed in a secondary heat exchanger positioned in a housing with the primary heat exchanger and combustion chamber. The two heat exchangers are coaxial coils with the secondary co... | 03/05/1985 |
| 4501261 | Instantaneous gas water heater Hot water supply temperature is set by a temperature setting device in response to an instantaneous flow rate signal from a water flow rate sensor arranged in a water supply pipe and a feeding water temperature signal from a feeding water temperature sens... | 02/26/1985 |
| 4492091 | Apparatus and method for controlling a heat pump water heater A method and apparatus for controlling the operation of an add-on heat pump water heater unit is disclosed. A combination of a thermally conductive tube having a flattened portion and a thermostat mounted thereto is utilized to sense the temperature level... | 01/08/1985 |
| 4445636 | Temperature comparison apparatus and methods A temperature comparison apparatus contains current-producing temperature sensors to measure outdoor temperature and heater temperature, a summing circuit to add the output currents from the sensors and a comparator circuit to compare the sum of the senso... | 05/01/1984 |
| 4421270 | Electronic temperature control An electronic temperature control circuit is disclosed for use with swimming pool and spa heaters. The circuit employs a thermistor for sensing water temperature, and provides temperature control with a narrow differential. Safety circuits are also employ... | 12/20/1983 |
| 4413775 | Water heater control system A water heater control system designed to conserve energy, in part by anticipating hot water demand as a function of usage, utilizes refined design features to effectively automatically switch the water heater's thermostat between a high and a low setting... | 11/08/1983 |
| 4363440 | Combustion control system A method and apparatus for controlling combustion in a process heater provides for efficient control of the combustion with a minimum of components. The apparatus includes means for generating a signal from a condition of a process such as temperature, or... | 12/14/1982 |
| 4274581 | Package heat exchanger system for heating and cooling A compact heating and cooling system in which air ducts are connected to a host exchanger system through which a coolant fluid from a condensing unit or a heating fluid from a compact water heater is selectively directed by a control circuit so that the s... | 06/23/1981 |
| 4262843 | Method of and apparatus for controlling the feed amount of air for combustion in a natural draft-type heating furnace A method of and apparatus for controlling the feed amount of air for combustion in a natural draft type heating furnace is disclosed, in which the draft pressure, the oxygen concentration in a combustion gas, the opening degree of a damper for controlling... | 04/21/1981 |
| 4261508 | Combustion control system A method and apparatus for controlling combustion in a process heater provides for efficient control of the combustion with a minimum of components. The apparatus includes means for generating a signal from a condition of a process, such as temperature, o... | 04/14/1981 |
| 4125151 | Package heat exchanger system for heating and cooling A compact heating and cooling system in which air ducts are connected to a heat exchanger system through which a coolant fluid from a condensing unit or a heating fluid from a compact water heater is selectively directed by a control circuit so that the s... | 11/14/1978 |
| 4102330 | Liquid vat heating apparatus Food products are cooked by immersing them in a body of hot liquid contained in a vat, and in order to maintain the liquid at a temperature level suitable for cooking purposes a gas burner underneath the vat is turned on periodically. Gas consumption is c... | 07/25/1978 |
| 4034911 | Burner control system A burner control system for a hot water boiler is responsive to both outlet water temperature and return water temperature to provide a relatively constant outlet water temperature regardless of variations in heat output requirements. A first thermistor r... | 07/12/1977 |
| 3964466 | Parallel fluid heating system A parallel water heating system having a plurality of water heaters supplying heated water to a plurality of water consuming loads. The water consuming outlet conduit from each of the water heaters includes a temperature responsive control valve that cont... | 06/22/1976 |
| 3960320 | Combustion optimizer There has been provided an improved process control optimizer for regulating at least one parameter of the process relative to optimum utilization of available energy. Temperature responsive open loop control means regulates the fuel flow and the optimize... | 06/01/1976 |
| 3946801 | Recuperator A recuperative heat exchanger for a gas turbine or similar source of intermittent heat having an auxiliary heating unit that provides heat to maintain the heat exchanger at a substantially constant temperature when heat being exhausted from the gas turbin... | 03/30/1976 |
