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FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL (heat-transfer, heat-exchange or heat-storage materials C09K 5/00; tube furnaces for thermal non-catalytic cracking C10G 9/20; devices, e.g. valves, for venting and aerating enclosures F16K 24/00 ; steam traps or like apparatus F16T; steam generation F22; combustion apparatus F23; domestic stoves or ranges F24B, F24C; domestic- or space-heating systems F24D; furnaces, kilns, ovens, retorts F27; heat-exchangers F28; electric heating elements or arrangements H05B)
Definition statement
This subclass/group covers:

Self-contained heaters comprising heat generating means for heating fluids:

  • Water heaters having heat generating means
  • Air heaters having heat generating means
  • Fluid heaters using a heat pump
  • Combined water and air heaters
  • Storage heaters in which energy is stored as heat in masses staying in the heater
  • Fluid heaters having means specially adapted for extracting latent heat from flue gases by means of condensation
  • Details thereof, including constructional details and control means for fluid heaters.
Relationship between large subject matter areas

Subclass F24H covers heater as such, i.e. the arrangements where the heat is generated.

Heaters integrated in a heating systems adapted for domestic- or space heating application, in which the heat is transmitted by a circuit to a consumer are classified in F24D.

Self-contained heaters of the type stoves or ranges are classified in F24B and F24C.

Subclass F24H concerns to the function of heating in general. Heaters adapted for special applications are classified both in F24H and in the relevant subclass for the application:

  • application in vehicles B60H or B60S;
  • apparatus for making beverages A47J.

The components of a heater are also classified in the relevant subclasses:

  • burners in F23B;
  • electric heating means in H05B;
  • heat pumps in F25B;
  • solar collector or geothermal systems in F24J;
  • heat exchangers in F28;
  • valves in F16K;
  • control of temperature in G05D 23/00.
References relevant to classification in this subclass
This subclass/group does not cover:
Baking ovens and apparatus for baking
Forge furnaces
Domestic stoves or ranges
Domestic or space heating systems
Driers for solid material
Furnaces, kilns, ovens, retorts
F27
Apparatus for making beverages
Application in vehicles
Informative references
Attention is drawn to the following places, which may be of interest for search:
Valves
Heat source: Burners
Heat source: Solar and geothermal heating means
Heat source: Heat pumps
Heat exchangers
Storage tanks
Heat source: Electric heating means
Controlling temperature
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Water includes other liquids;air includes other gases or gas mixtures
"water" and "air" always mean respectively, the liquid and gas to be heated
Furnace tubes
means tubes inside the heater wherein combustion is performed
Fire tubes
means tubes inside the heater wherein combustion is performed
Water tubes
means the tubes inside the heater through which water to be heated flows
Heater
means apparatus including both heat generating means and means for transferring the generated heat to water or air
Water heaters having heat generating means, e.g. boiler, flow- heater (F24H 7/00, F24H 8/00 take precedence; details F24H 9/00; steam boilers F22B; domestic stoves or ranges with additional provisions for heating water F24B 9/00, F24C 13/00)
Definition statement
This subclass/group covers:

Water heaters having generating means of the following kind:

  • With reduced pressure or of the vacuum steam type;
  • Electrically heated;
  • Using fluid fuel;
  • Immersion haters for open containers of ponds;
  • Using solid fuel;
  • Special heating applications, i.e. heated bath tubs, vehicles;
  • portable or mobile heaters;
  • packaged or self-contained boilers comprising water heaters with control devices and pump in a single unit;
  • Continuous-flow heaters, i.e. which heat is generated only while the water is flowing, said heater arranged either with water separated form the heating medium or with direct contact of the water with the heating medium;
  • Water storage heaters;
  • Water heaters other than continuous-flow or water storage heaters, e.g. water-heaters for central heating;
  • Water heaters having plural combustion chambers;
  • Water heaters for central heating incorporating heaters for domestic water.
Relationship between large subject matter areas

The group heaters of the reduced pressure of vacuum steam type (F24H 1/0009) is rarely used. Steam boilers as such are covered by F22B.

The group heaters using solid fuel (F24H 1/0063) is rarely used. Domestic stoves or ranges with additional provisions for heating water are covered by F24B 9/00, F24C 13/00.

In the group water storage heaters (F24H 1/18) the water muss be able to flow outside the storage tank for being used. If the storage mass, which can be water, stays in the tank and there is a further intermediate medium for conveying the heat, this arrangement is only classified in F24H 7/00.

Water heaters with a heating pump as heat source are classified in F24H 4/00.

Water heaters extracting latent heat from flue gases (condensing boilers) are classified in F24H 8/00.

The group F24H 1/48 covers water heaters for central heating incorporating heaters for domestic water, i.e. the heaters (tank, heat exchanger) for domestic water have to be within the boiler. If the domestic water heaters are located outside of the boiler, the invention is classified in F24D 3/08.

Heat exchangers which are exclusively used in boilers are classified in this group. Heat exchangers being able to be used in a boiler and elsewhere are classified both in this group and in the relevant subclass in F28.

Arrangement or mountings of control or safety device for water heaters are covered by F24H 9/20.

References relevant to classification in this group
This subclass/group does not cover:
Steam boilers
Domestic stoves or ranges with additional provisions for heating water
Fluid heaters having heat-generating means specially adapted for extracting latent heat from flue gases by means of condensation; Condensing boilers
Storage heater
Informative references
Attention is drawn to the following places, which may be of interest for search:
Cooking vessels
Apparatus for making beverages
Apparatus for making beverages
Bathing devices for therapeutic purposes
Windscreen washers comprising a water heater
Details concerning the thermal insulation of a container
Details of washing machines
Plumbing installations for fresh water having heating or cooling apparatus
Heating swimming pools
Heating or cooling pipes or pipe systems
Steam boilers of furnace-tube type, i.e. the combustion of fuel being performed inside one or more furnace tubes built-in in the boiler body
Details of baffles or deflectors within the combustion chamber
Domestic stoves or ranges with additional provisions for heating water
Other domestic stoves or ranges with additional provisions for heating water
Central heating systems using heat accumulated in storage masses
Hot-water central heating systems in combination with systems for domestic hot-water supply
Liquid storage heaters using heat pumps
Details of fluid heaters
Solar heating of swimming pools
Tubular heat-exchangers
Tubular elements, Assemblies of tubular elements
Ohmic-resistance heating
Ohmic-resistance heating
Solid fuel fired boiler
Air heaters having heat generating means (F24H 7/00, F24H 8/00 take precedence; details F24H 9/00; domestic stoves or ranges with additional provision for convection heating of air F24B, F24C)
Definition statement
This subclass/group covers:

Air heaters sorted by the type of heat source: e.g. using electric energy supply or using fluid combustible or using solid combustibles.

Air heaters with forced circulation of air.

Air heaters with a main heat source and additional heating arrangements.

This group covers air heaters where the air is heated at the same location where the heat is generated.

Relationship between large subject matter areas

Central heating radiators are not considered as an air heater as covered in this group. The central heating radiators as such are covered by F28D 1/00.Central hating radiators comprising additional heating means located within the radiator are covered by F24D 13/04.

Hot-air central heating systems are covered by F24D 5/00.

Ventilation systems which can be heated and cooled are covered by F24F.

Air heaters adapted for special applications are classified both in F24H 3/00 and in the relevant subclass for the application:

References relevant to classification in this group
This subclass/group does not cover:
Central heating radiators for heating air comprising an additional electric heating means
Hot air central heating system
Air conditioning devices which provide heated and cooled air
Lighting fixture and air heating means
Air heaters in which the air is heated by a heat pump
Storage heater
Fluid heaters having heat-generating means specially adapted for extracting latent heat from flue gases by means of condensation; Condensing boilers
Central heating radiators as such

Examples of places where the subject matter of this group is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Adapted for hair drying
Adapted for welding
Adapted to be used in vehicles
Informative references
Attention is drawn to the following places, which may be of interest for search:
Hair dryers
Welding wherein the heat is provided by a hot air stream
Interaction of the air heater with the vehicle (mounting a heater with in a vehicle)
Towel racks, Towel rails, Towel rods, Towel rolls
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

For air heaters using electric energy supply, the term

Heating medium
means the resistive element
Direct contact
means that the resistive element, electrodes and fins are bond together without additional elements (e.g. tubes or plates) in between
Fluid heaters using heat pumps
Definition statement
This subclass/group covers:

Liquid or gas heaters using heat pumps as heat source.

References relevant to classification in this group
This subclass/group does not cover:
Air conditioning devices using heat pumps which provide heated and cooled air
Informative references
Attention is drawn to the following places, which may be of interest for search:
Other domestic or non-central space heating system, consisting of self-contained heating units
Combined water and air heaters
Heat pumps (heat of condenser is used for a specific purpose, e.g. heating tap water)
Heat storage plants or apparatus in general
Combined water and air heaters (F24H 8/00 takes precedence)
Definition statement
This subclass/group covers:

Combined water and air heaters.

References relevant to classification in this group
This subclass/group does not cover:
Fluid heaters having heat-generating means specially adapted for extracting latent heat from flue gases by means of condensation
F28H8/00
Informative references
Attention is drawn to the following places, which may be of interest for search:
Hot-air central heating systems
Hot-air central heating systems using heat pumps
Storage heaters, i.e. heaters in which energy is stored as heat in masses for subsequent release (domestic stoves or ranges with additional heat storage masses F24B 1/24, F24C 15/34)
Definition statement
This subclass/group covers:

Storage heaters ranked by the kind of the heat source, in which the heat storing material stays in the heater and wherein the released heat is either conveyed to a transfer fluid, e.g. air, water or the released heat is radiated.

Relationship between large subject matter areas

Water storage heaters where the heated water is able to flow outside the storage tank for being used are covered by F24H 1/18.

References relevant to classification in this group
This subclass/group does not cover:
Domestic stoves or ranges with additional heat storage masses
Elements and arrangements for heat storage
Water storage heaters
Informative references
Attention is drawn to the following places, which may be of interest for search:
Storage materials
Material undergoing a change of physical state when being used
Central heating systems using heat accumulated in storage masses
Electric heating systems with resistances incorporated in construction elements, e.g. panels
Air-conditioning systems or apparatus not covered by F24F 1/00 or F24F 3/00 [N: e.g. using solar heat, combined with household units such as an oven or water heater]
Heat storage plants or apparatus
Fluid heaters having heat-generating means specially adapted for extracting latent heat from flue gases by means of condensation
Definition statement
This subclass/group covers:

Fluid heaters arranged in a self-contained manner:

  • having heat-generating means specially adapted for extracting latent heat from flue gases by means of condensation located within the heater
  • having means for moistening the combustion air with condensate from the combustion gases
  • having means for removing condensate from the heater.
Relationship between large subject matter areas

This group covers the arrangements of condensing boilers where the condensing heat exchanger is located inside the boiler.

The arrangements where the condensing heat exchanger is located outside the boiler (e.g. economizer) are covered by F24D 12/02 combined with F24D 2200/18.

References relevant to classification in this group
This subclass/group does not cover:
Fluid heaters in combination with a separate flue gas condenser
Informative references
Attention is drawn to the following places, which may be of interest for search:
Arrangements for treating smokes in the chimneys, in particular coolers
Flue gas condenser
Fumes purifications: water draining devices associated with fumes
Details
Definition statement
This subclass/group covers:

Details of liquid/water heaters and gas/air heaters.

Casings; Cover lids; Ornamental panels therefore (not for central heating radiators).

Arrangement of mountings or supports therefore (not for central heating radiators).

Connecting heaters to circulation pipes.

Connecting different sections within water-heaters.

Arrangements for water drainage.

Arrangement or mounting of grates, burners, or heating elements within the heater.

Arrangement or mounting of control or safety devices.

Combustion air preheating arrangements.

Fluid heaters having electric generators.

Details about the kind of electrical heat generating means.

Relationship between large subject matter areas

This group covers details concerning the device generating the heat.

Details concerning central heating radiators are covered by F24D.

Valves which are exclusively used in boilers are classified in this group. Valves being able to be used elsewhere are classified in the relevant subclass in F16K.

Pipe joints which are exclusively used in boilers are classified in this group. Pipe joints being able to be used elsewhere are classified in the relevant subclass in F16L.

Details concerning the control of a boiler are covered inF24H 9/20. Arrangements for control of temperature and algorithm therefore are also covered in G05D 23/00. In the particular case of electric heating means, the controls/automatic switching for the electric heater are also covered by H05B 1/02.

References relevant to classification in this group
This subclass/group does not cover:
Control valves
Safety devices for burners
Combustion control devices
Arrangements for mountings or supports for central heating radiators
Casings, cover lids or ornamental panels for central heating radiators
Connecting central heating radiator to circulation pipes
Arrangements for connecting different sections of heat exchange elements, e.g. of radiators
Informative references
Attention is drawn to the following places, which may be of interest for search:
Constructional details of combustion chambers , not otherwise provided for
Regulating or controlling combustion
Arrangements for drainage, venting or aerating in domestic- or space heating systems
Casings, Header boxes, Auxiliary supports for elements, Auxiliary members within casings
This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013