Cooperative Patent Classification

CPC Definition - Subclass F24H

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Last Updated Version: 2016.11
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 place 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.
Relationships with other classification places

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
Limiting references

This place 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

Application-oriented references

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

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

Controlling temperature

Heat source: Electric heating means

Glossary of terms

In this place, 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, water-storage 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 place 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.
Relationships with other classification places

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
Limiting references

This place does not cover:

Storage heater

Fluid heaters having heat-generating means specially adapted for extracting latent heat from flue gases by means of condensation; Condensing boilers

Steam boilers

Domestic stoves or ranges with additional provisions for heating water

Informative references

Attention is drawn to the following places, which may be of interest for search:

Liquid storage heaters using heat pumps

Details of fluid heaters

Solid fuel fired boiler

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

Hot-water central heating systems in combination with systems for domestic hot-water supply

Central heating systems using heat accumulated in storage masses

Solar heating of swimming pools

Tubular heat-exchangers

Tubular elements, Assemblies of tubular elements

Ohmic-resistance heating

Ohmic-resistance heating

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 place 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.

Relationships with other classification places

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
Limiting references

This place does not cover:

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

Hot air central heating system

Central heating radiators for heating air comprising an additional electric heating means

Air conditioning devices which provide heated and cooled air

Lighting fixture and air heating means

Central heating radiators as such

Application-oriented references

Examples of places where the subject matter of this place 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

Towel racks, Towel rails, Towel rods, Towel rolls

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)

Glossary of terms

In this place, 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 place covers:

Liquid or gas heaters using heat pumps as heat source.

References
Limiting references

This place 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:

Combined water and air heaters

Other domestic or non-central space heating system, consisting of self-contained heating units

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 place covers:

Combined water and air heaters.

References
Limiting references

This place does not cover:

Fluid heaters having heat-generating means specially adapted for extracting latent heat from flue gases by means of condensation

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 place 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.

Relationships with other classification places

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
Limiting references

This place does not cover:

Water storage heaters

Domestic stoves or ranges with additional heat storage masses

Elements and arrangements for heat storage

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 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 place 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.
Relationships with other classification places

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
Limiting references

This place 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

Fumes purifications: water draining devices associated with fumes

Flue gas condenser

Details
Definition statement

This place 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.

Relationships with other classification places

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 in F24H 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
Limiting references

This place does not cover:

Control valves

Safety devices for burners

Combustion control devices

Connecting central heating radiator to circulation pipes

Arrangements for mountings or supports for central heating radiators

Casings, cover lids or ornamental panels for central heating radiators

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