F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL steam generation F22The distinguishing feature of the air heaters covered by this subclass is that the heat is predominantly released to the air by convection, mostly by forced circulation of the air. The domestic stoves or ranges covered by subclasses F24B, F24C may also be fired or electric air heaters but they release their heat to a considerable extent by radiation and only to some extent by natural convection.In this subclass, the following terms are used with the meanings indicated: "water" includes other liquids and means always the liquid to be heated;"air" includes other gases or gas mixtures and means always the gas to be heated; "furnace tubes" means tubes inside the heater wherein combustion is performed;"fire tubes" means tubes inside the heater through which flue-gases flow from a combustion chamber located outside the tubes; "heater" means apparatus including both heat generating means and means for transferring the generated heat to water or air.All storage heaters are classified in group F24H7/00. F24H1/00 F24H1/00Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters steam boilers F22B F24H1/0009of the reduced pressure or vacuum steam type F24H1/0018using electric energy supply F24H1/0027using fluid fuel F24H1/0036of the sealed type F24H1/0045with catalytic combustion F24H1/0054Gas- or oil-fired immersion heaters for open containers or ponds F24H1/0063using solid fuel F24H1/0072Special adaptations F24H1/009for vehicle systems F24H1/06Portable or mobile, e.g. collapsible F24H1/08Packaged or self-contained boilers, i.e. water heaters with control devices and pump in a single unit F24H1/10Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium F24H1/101using electric energy supply F24H1/102with resistance F24H1/103with bare resistances in direct contact with the fluid F24H1/105formed by the tube through which the fluid flows F24H1/106with electrodes F24H1/107using fluid fuel F24H1/108using solid fuel F24H1/12in which the water is kept separate from the heating medium F24H1/121using electric energy supply F24H1/122combined with storage tank F24H1/124using fluid fuel F24H1/125combined with storage tank F24H1/127using solid fuel F24H1/128combined with storage tank F24H1/14by tubes, e.g. bent in serpentine form F24H1/142using electric energy supply F24H1/145using fluid fuel F24H1/147using solid fuel F24H1/16helically or spirally coiled F24H1/162using electrical energy supply F24H1/165using fluid fuel F24H1/167using solid fuel F24H1/18Water-storage heaters F24H1/181Construction of the tank F24H1/182Insulation F24H1/183Inner linings F24H1/185using electric energy supply F24H1/201 takes precedence F24H1/186using fluid fuel F24H1/187using solid fuel F24H1/188with means for compensating water expansion F24H1/20with immersed heating elements, e.g. electric elements or furnace tubes F24H1/201using electric energy supply F24H1/202with resistances F24H1/203with electrodes F24H1/205with furnace tubes F24H1/206with submerged combustion chamber F24H1/207with water tubes F24H1/208with tubes filled with heat transfer fluid F24H1/22Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating F24H1/225electrical central heating boilers F24H1/24with water mantle surrounding the combustion chamber or chambers F24H1/26the water mantle forming an integral body F24H1/263with a dry-wall combustion chamber F24H1/28including one or more furnace or fire tubes F24H1/282with flue gas passages built-up by coaxial water mantles F24H1/285with the fire tubes arranged alongside the combustion chamber F24H1/287with the fire tubes arranged in line with the combustion chamber F24H1/30the water mantle being built up from sections F24H1/32with vertical sections arranged side by side F24H1/34with water chamber arranged adjacent to the combustion chamber or chambers, e.g. above or at side F24H1/36the water chamber including one or more fire tubes F24H1/38with water contained in separate elements, e.g. radiator-type element F24H1/40with water tube or tubes F24H1/403the water tubes being arranged in one or more circles around the burner F24H1/406the tubes forming a membrane wall F24H1/41in serpentine form F24H1/43helically or spirally coiled F24H1/44with combinations of two or more of the types covered by groups F24H1/24 - F24H1/40  , e.g. boilers having a combination of features covered by F24H1/24 - F24H1/40 F24H1/445with integrated flue gas condenser F24H1/46Water heaters having plural combustion chambers F24H1/48Water heaters for central heating incorporating heaters for domestic water F24H1/50incorporating domestic water tanks F24H1/52incorporating heat exchangers for domestic water F24H1/50 takes precedence F24H1/523Heat exchangers for sanitary water directly heated by the burner F24H1/526Pipes in pipe heat exchangers for sanitary water F24H1/54Water heaters for bathtubs or poolsWater heaters for reheating the water in bathtubs or pools F24H3/00Air heaters F24H3/002using electric energy supply F24H3/004with a closed circuit for a heat transfer liquid F24H3/006using fluid fuel F24H3/008using solid fuel F24H3/02with forced circulation F24H3/022using electric energy supply F24H3/025using fluid fuel F24H3/027using solid fuel F24H3/04the air being in direct contact with the heating medium, e.g. electric heating element F24H3/0405using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between F24H3/06, F24H3/08, F24H3/10 take precedence F24H3/0411for domestic or space-heating systems F24H3/0417portable or mobile F24H3/0423hand-held air guns F24H3/0429For vehicles F24H3/0435Structures comprising heat spreading elements in the form of fins F24H3/0441Interfaces between the electrodes of a resistive heating element and the power supply means F24H3/0447Forms of the electrode terminals, e.g. tongues or clips F24H3/0452Frame constructions F24H3/0458One-piece frames F24H3/0464Two-piece frames, e.g. two-shell frames, also including frames as a central body with two covers F24H3/047Multiple-piece frames assembled on their four or more edges F24H3/0476Means for putting the electric heaters in the frame under strain, e.g. with springs F24H3/0482Frames with integrated fan F24H3/0488using fluid fuel F24H3/0494using solid fuel F24H3/06the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators F24H3/062using electric energy supply; the heating medium being the resistive element F24H3/08, F24H3/10 takes precedence F24H3/065using fluid fuel F24H3/067using solid fuel F24H3/08by tubes F24H3/081using electric energy supply F24H3/082The tubes being an electrical isolator containing the heater F24H3/084The tubes being an electrode for the heater F24H3/085The tubes containing an electrically heated intermediate fluid, e.g. water F24H3/087using fluid fuel F24H3/088using solid fuel F24H3/10by plates F24H3/102using electric energy supply F24H3/105using fluid fuel F24H3/107using solid fuel F24H3/12with additional heating arrangements F24H4/00Fluid heaters characterised by the use of heat pumps F24H4/02Water heaters F24H4/04Storage heaters F24H4/06Air heaters F24H6/00Combined water and air heaters F24H7/00Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release F24H7/002using electrical energy supply F24H7/005using fluid fuel F24H7/007using solid fuel F24H7/02the released heat being conveyed to a transfer fluid F24H7/0208using electrical energy supply F24H7/0216the transfer fluid being air F24H7/0225with supplementary heating means F24H7/0233the transfer fluid being water F24H7/0241with supplementary heating means F24H7/025using fluid fuel F24H7/0258the transfer fluid being air F24H7/0266the transfer fluid being water F24H7/0275using solid fuel F24H7/0283the transfer fluid being air F24H7/0291the transfer fluid being water F24H7/04with forced circulation of the transfer fluid F24H7/0408using electrical energy supply F24H7/0416the transfer fluid being air F24H7/0425with supplementary heating means F24H7/0433the transfer medium being water F24H7/0441with supplementary heating means F24H7/045using fluid fuel F24H7/0458the transfer fluid being air F24H7/0466the transfer fluid being water F24H7/0475using solid fuel F24H7/0483the transfer fluid being air F24H7/0491the transfer fluid being water F24H7/06the released heat being radiated F24H7/062with electrical energy supply F24H7/065with fluid fuel F24H7/067with solid fuel F24H8/00Fluid heaters characterised by means for extracting latent heat from flue gases by means of condensation F24H8/003having means for moistening the combustion air with condensate from the combustion gases F24H8/006Means for removing condensate from the heater F24H9/00Details F24H9/0005for water heaters F24H9/001Guiding means F24H9/0015in water channels F24H9/0021Sleeves surrounding heating elements or heating pipes, e.g. pipes filled with heat transfer fluid, for guiding heated liquid F24H9/0026in combustion gas channels F24H9/0031with means for changing or adapting the path of the flue gas F24H9/0036Dispositions against condensation of combustion products F24H9/0042Cleaning arrangements F24H9/0052for air heaters F24H9/0057Guiding means F24H9/0063in air channels F24H9/0068in combustion gas channels F24H9/0073Arrangement or mounting of means for forcing the circulation of air F24H9/0078for storage heaters F24H9/0084Combustion air preheating F24H9/0089by double wall boiler mantle F24H9/0094having means for transporting the boiler F24H9/02CasingsCover lidsOrnamental panels F24H9/06Arrangement of mountings or supports for heaters, e.g. boilers, other than space heating radiators space heating radiators F24D19/02 F24H9/12Arrangements for connecting heaters to circulation pipes F24H9/13for water heaters F24H9/133Storage heaters F24H9/136Arrangement of inlet valves used therewith F24H9/139Continuous flow heaters F24H9/14Arrangements for connecting different sections, e.g. in water heaters  arrangements for connecting heaters to circulation pipes F24H9/12 F24H9/142Connecting hydraulic components F24H9/144Valve seats, piping and heat exchanger connections integrated into a one-piece hydraulic unit F24H9/146Connecting elements of a heat exchanger F24H9/148Arrangements of boiler components on a frame or within a casing to build the fluid heater, e.g. boiler F24H9/16Arrangements for water drainage  F24H9/17Means for retaining water leaked from heaters F24H9/18Arrangement or mounting of grates or heating means F24H9/1809for water heatersGroup F24H9/1809 is impacted by reclassification into group F24H9/1832.
Groups F24H9/1809 and F24H9/1832 should be considered in order to perform a complete search. F24H9/1818Arrangement or mounting of electric heating means F24H9/1827Positive temperature coefficient [PTC] resistor F24H9/1832Arrangement or mounting of combustion heating means, e.g. grates or burnersGroup F24H9/1832 is incomplete pending reclassification of documents from group F24H9/1809.
Groups F24H9/1809 and F24H9/1832 should be considered in order to perform a complete search. F24H9/1836using fluid fuel F24H9/1845using solid fuel F24H9/1854for air heatersGroup F24H9/1854 is impacted by reclassification into group F24H9/1877.
Groups F24H9/1854 and F24H9/1877 should be considered in order to perform a complete search. F24H9/1863Arrangement or mounting of electric heating means F24H9/1872PTC F24H9/1877Arrangement or mounting of combustion heating means, e.g. grates or burnersGroup F24H9/1877 is incomplete pending reclassification of documents from group F24H9/1854.
Groups F24H9/1854 and F24H9/1877 should be considered in order to perform a complete search. F24H9/1881using fluid fuel F24H9/189using solid fuel F24H9/20Arrangement or mounting of control or safety devicesGroup F24H9/20 is impacted by reclassification into groups F24H9/25, F24H9/28, and F24H15/00 - F24H15/493.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/2007for water heatersGroup F24H9/2007 is impacted by reclassification into groups F24H9/25, F24H9/28, and F24H15/00 - F24H15/493.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/2014using electrical energy supplyGroup F24H9/2014 is impacted by reclassification into groups F24H9/25, F24H9/28, and F24H15/00 - F24H15/493.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/2021Storage heatersGroup F24H9/2021 is impacted by reclassification into groups F24H9/25, F24H9/28, and F24H15/00 - F24H15/493.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/2028Continuous-flow heatersGroup F24H9/2028 is impacted by reclassification into groups F24H9/25, F24H9/28, and F24H15/00 - F24H15/493.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/2035using fluid fuelGroup F24H9/2035 is impacted by reclassification into groups F24H9/25, F24H9/28, and F24H15/00 - F24H15/493.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/2042Preventing or detecting the return of combustion gasesGroup F24H9/2042 is impacted by reclassification into groups F24H9/25, F24H9/28, and F24H15/00 - F24H15/493.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/205Closing the energy supplyGroup F24H9/205 is impacted by reclassification into groups F24H9/25, F24H9/28, and F24H15/00 - F24H15/493.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/2057using solid fuelGroup F24H9/2057 is impacted by reclassification into groups F24H9/25, F24H9/28, and F24H15/00 - F24H15/493.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/2064for air heatersGroup F24H9/2064 is impacted by reclassification into groups F24H9/25, F24H9/28, and F24H15/00 - F24H15/493.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/2071using electrical energy supplyGroup F24H9/2071 is impacted by reclassification into groups F24H9/25, F24H9/28, and F24H15/00 - F24H15/493.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/2078Storage heatersGroup F24H9/2078 is impacted by reclassification into groups F24H9/25, F24H9/28, and F24H15/00 - F24H15/493.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/2085using fluid fuelGroup F24H9/2085 is impacted by reclassification into groups F24H9/25, F24H9/28, and F24H15/00 - F24H15/493.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/2092using solid fuelGroup F24H9/2092 is impacted by reclassification into groups F24H9/25, F24H9/28, and F24H15/00 - F24H15/493.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/25of remote control devices or control-panelsGroups F24H9/25 and F24H9/28 are incomplete pending reclassification of documents from groups F24H9/20, F24H9/2007, F24H9/2014, F24H9/2021, F24H9/2028, F24H9/2035, F24H9/2042, F24H9/205, F24H9/2057, F24H9/2064, F24H9/2071, F24H9/2078, F24H9/2085, and F24H9/2092.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/28characterised by the graphical user interface [GUI] F24H9/40Arrangements for preventing corrosionGroups F24H9/40, F24H9/455, and F24H9/457 are incomplete pending reclassification of documents from group F24H9/45.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/45for preventing galvanic corrosion, e.g. cathodic or electrolytic meansGroup F24H9/45 is impacted by reclassification into groups F24H9/40, F24H9/455, and F24H9/457.
All groups listed in this Warning should be considered in order to perform a complete search. F24H9/455for water heaters F24H9/457for air heaters F24H15/00Control of fluid heatersGroups F24H15/00 - F24H15/493 are incomplete pending reclassification of documents from groups F24D19/10 - F24D19/1096 and F24H9/20 - F24H9/2092.
All groups listed in this Warning should be considered in order to perform a complete search. F24H15/10characterised by the purpose of the control F24H15/104InspectionDiagnosisTrial operation F24H15/108Resuming operation, e.g. after power outages F24H15/112Preventing or detecting blocked flues F24H15/116Disabling the heating means in response thereto F24H15/12Preventing or detecting fluid leakage F24H15/124Preventing or detecting electric faults, e.g. electric leakage F24H15/128Preventing overheating F24H15/132Preventing the operation of water heaters with low water levels, e.g. dry-firing F24H15/136Defrosting or de-icingPreventing freezing F24H15/14CleaningSterilisingPreventing contamination by bacteria or microorganisms, e.g. by replacing fluid in tanks or conduits F24H15/144Measuring or calculating energy consumption F24H15/148Assessing the current energy consumption F24H15/152Forecasting future energy consumption F24H15/156Reducing the quantity of energy consumedIncreasing efficiency F24H15/16Reducing cost using the price of energy, e.g. choosing or switching between different energy sources F24H15/164where the price of the electric supply changes with time F24H15/168Reducing the electric power demand peak F24H15/172Scheduling based on user demand, e.g. determining starting point of heating F24H15/174Supplying heated water with desired temperature or desired range of temperature F24H15/175where the difference between the measured temperature and a set temperature is kept under a predetermined value F24H15/176Improving or maintaining comfort of users F24H15/18Preventing sudden or unintentional change of fluid temperature F24H15/184Preventing harm to users from exposure to heated water, e.g. scalding F24H15/196Automatically filling bathtubs or poolsReheating the water in bathtubs or pools F24H15/20characterised by control inputs F24H15/204Temperature of the air before heating F24H15/208Temperature of the air after heating F24H15/212Temperature of the water F24H15/215before heating F24H15/219after heating F24H15/223in the water storage tank F24H15/225at different heights of the tank F24H15/227Temperature of the refrigerant in heat pump cycles F24H15/231at the evaporator F24H15/232at the condenser F24H15/235Temperature of exhaust gases F24H15/238Flow rate F24H15/242Pressure F24H15/246Water level F24H15/248of water storage tanks F24H15/25Temperature of the heat-generating means in the heater F24H15/254Room temperature F24H15/258Outdoor temperature F24H15/262Weather information or forecast F24H15/265Occupancy F24H15/269Time, e.g. hour or date F24H15/273Address or location F24H15/277Price F24H15/281Input from user F24H15/288Accumulation of deposits, e.g. lime or scale F24H15/292Metering of electricity sold to the grid F24H15/296Information from neighbouring devices F24H15/30characterised by control outputscharacterised by the components to be controlled F24H15/305Control of valves of heat pumps F24H15/385, F24H15/39 F24H15/31of valves having only one inlet port and one outlet port, e.g. flow rate regulating valves F24H15/315of mixing valves F24H15/32of switching valves for by-passing F24H15/325 F24H15/325of by-pass valves F24H15/33Control of dampers F24H15/335Control of pumps, e.g. on-off control control of compressors of heat pumps F24H15/38 F24H15/34Control of the speed of pumps F24H15/345Control of fans, e.g. on-off control control of fans of heat pump units F24H15/375 F24H15/35Control of the speed of fans F24H15/355Control of heat-generating means in heaters F24H15/36of burners F24H15/365of two or more burners, e.g. an array of burners F24H15/37of electric heaters F24H15/375Control of heat pumps F24H15/38Control of compressors of heat pumps F24H15/385Control of expansion valves of heat pumps F24H15/39Control of valves for distributing refrigerant to different evaporators or condensers in heat pumps F24H15/395Information to users, e.g. alarms F24H15/40characterised by the type of controllers F24H15/407using electrical switching, e.g. TRIAC F24H15/414using electronic processing, e.g. computer-based F24H15/421using pre-stored data F24H15/429for selecting operation modes F24H15/436for selecting sleeping modes F24H15/443using a central controller connected to several sub-controllers F24H15/45remotely accessible F24H15/457using telephone networks or Internet communication F24H15/464using local wireless communication F24H15/479for programming the system F24H15/486using timers F24H15/493specially adapted for enabling recognition of parts newly installed in the fluid heating system, e.g. for retrofitting or for repairing by replacing parts F24H2203/00 F24H2203/00** to be deleted ** F24H2210/00Burner and heat exchanger are integrated F24H2220/00Measures for environmentally correct disposal F24H2230/00Solid fuel fired boiler F24H2230/02Solid and fluid fuel fired boilers F24H2240/00Fluid heaters having electrical generatorsGroup F24H2240/00 is impacted by reclassification into groups F24D18/00 and F24D2101/00 - F24D2105/10.
Groups F24H2240/00, F24D18/00 and F24D2101/00 - F24D2105/10 should be considered in order to perform a complete search. F24H2240/01Batteries, electrical energy storage deviceGroup F24H2240/01 is impacted by reclassification into groups F24D18/00 and F24D2101/00 - F24D2105/10.
Groups F24H2240/01, F24D18/00 and F24D2101/00 - F24D2105/10 should be considered in order to perform a complete search. F24H2240/02with combustion enginesGroup F24H2240/02 is impacted by reclassification into groups F24D18/00 and F24D2101/00 - F24D2105/10.
Groups F24H2240/02, F24D18/00 and F24D2101/00 - F24D2105/10 should be considered in order to perform a complete search. F24H2240/04External combustion enginesGroup F24H2240/04 is impacted by reclassification into groups F24D18/00 and F24D2101/00 - F24D2105/10.
Groups F24H2240/04, F24D18/00 and F24D2101/00 - F24D2105/10 should be considered in order to perform a complete search. F24H2240/06Internal combustion enginesGroup F24H2240/06 is impacted by reclassification into groups F24D18/00 and F24D2101/00 - F24D2105/10.
Groups F24H2240/06, F24D18/00 and F24D2101/00 - F24D2105/10 should be considered in order to perform a complete search. F24H2240/08with peltier elementsGroup F24H2240/08 is impacted by reclassification into groups F24D18/00 and F24D2101/00 - F24D2105/10.
Groups F24H2240/08, F24D18/00 and F24D2101/00 - F24D2105/10 should be considered in order to perform a complete search. F24H2240/09with photovoltaic cellsGroup F24H2240/09 is impacted by reclassification into groups F24D18/00 and F24D2101/00 - F24D2105/10.
Groups F24H2240/09, F24D18/00 and F24D2101/00 - F24D2105/10 should be considered in order to perform a complete search. F24H2240/10with fuel cellsGroup F24H2240/10 is impacted by reclassification into groups F24D18/00 and F24D2101/00 - F24D2105/10.
Groups F24H2240/10, F24D18/00 and F24D2101/00 - F24D2105/10 should be considered in order to perform a complete search F24H2240/12with thermodynamic cycle for converting thermal energy to mechanical power to produce electrical energyGroup F24H2240/12 is impacted by reclassification into groups F24D18/00 and F24D2101/00 - F24D2105/10.
Groups F24H2240/12, F24D18/00 and F24D2101/00 - F24D2105/10 should be considered in order to perform a complete search. F24H2240/122Stirling cyclesGroup F24H2240/122 is impacted by reclassification into groups F24D18/00 and F24D2101/00 - F24D2105/10.
Groups F24H2240/122, F24D18/00 and F24D2101/00 - F24D2105/10 should be considered in order to perform a complete search. F24H2240/125Carnot cyclesGroup F24H2240/125 is impacted by reclassification into groups F24D18/00 and F24D2101/00 - F24D2105/10.
Groups F24H2240/125, F24D18/00 and F24D2101/00 - F24D2105/10 should be considered in order to perform a complete search. F24H2240/127Rankine cycles, e.g. steam heat enginesGroup F24H2240/127 is impacted by reclassification into groups F24D18/00 and F24D2101/00 - F24D2105/10.
Groups F24H2240/127, F24D18/00 and F24D2101/00 - F24D2105/10 should be considered in order to perform a complete search. F24H2250/00Electrical heat generating means F24H2250/02Resistances F24H2250/04Positive or negative temperature coefficients, e.g. PTC, NTC F24H2250/06Peltier F24H2250/08Induction F24H2250/10Electrodes F24H2250/12Microwaves F24H2250/14Lamps