DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR (using steam or condensate extracted or exhausted from steam engine plants for heating purposes F01K17/02)

Introduced: September 1968

Description

F24D covers complete heating and hot-water supply systems for residential and commercial spaces, including central heating installations, boiler systems, heat distribution networks, and associated control mechanisms. It encompasses both the system architecture (radiators, pipes, pumps, expansion vessels) and individual functional components that enable thermal comfort in buildings. This classification includes conventional fossil-fuel-based systems as well as renewable heating technologies such as heat pumps and solar thermal systems. Related heating technologies for industrial processes or specialized applications are classified elsewhere within the F24 series.

Title

Titles differ between systems:

IPC: DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR

CPC: DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR (using steam or condensate extracted or exhausted from steam engine plants for heating purposes F01K17/02)

Full Title

Full titles differ between systems:

IPC:

DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR

CPC:

DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR (using steam or condensate extracted or exhausted from steam engine plants for heating purposes F01K17/02)

Of 22 combined children, 13 exist in both systems.

6 codes are CPC-only extensions, 3 exist only in IPC.

Note: 6 CPC extensions are marked as secondary classification only.

7 shared codes have differing titles between IPC and CPC.

Child Classifications

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F24D 1/00 Steam central heating systems (district heating systems F24D10/00; central heating systems using heat accumulated in storage masses F24D11/00) +1 CPC IPC+CPC Available in IPC and CPC
F24D 10/00 District heating systems since 1990 +2 CPC IPC+CPC Available in IPC and CPC
F24D 101/00 Electric generators of small-scale CHP systems since 2022 −8 IPC IPC only IPC only
F24D 103/00 Thermal aspects of small-scale CHP systems since 2022 −2 IPC IPC only IPC only
F24D 105/00 Constructional aspects of small-scale CHP systems since 2022 −1 IPC IPC only IPC only
F24D 11/00 Central heating systems using heat accumulated in storage masses (self-contained storage heating units F24D15/02) +3 CPC IPC+CPC Available in IPC and CPC
F24D 12/00 Other central heating systems IPC+CPC Available in IPC and CPC
F24D 13/00 Electric heating systems IPC+CPC Available in IPC and CPC
F24D 15/00 Other domestic- or space-heating systems IPC+CPC Available in IPC and CPC
F24D 17/00 Domestic hot-water supply systems +8 CPC IPC+CPC Available in IPC and CPC
F24D 18/00 Small-scale combined heat and power [CHP] generation systems specially adapted for domestic heating, space heating or domestic hot-water supply since 2022 IPC+CPC Available in IPC and CPC
F24D 19/00 Details (of water or air heaters F24H9/00; of heat-exchange or heat-transfer apparatus, of general application F28F) since 1980 +5 CPC IPC+CPC Available in IPC and CPC
F24D 2101/00 Electric generators of small-scale CHP systems 2nd only +8 CPC CPC only CPC only
F24D 2103/00 Thermal aspects of small-scale CHP systems 2nd only +2 CPC CPC only CPC only
F24D 2105/00 Constructional aspects of small-scale CHP systems 2nd only +1 CPC CPC only CPC only
F24D 2200/00 Heat sources or energy sources 2nd only +13 CPC CPC only CPC only
F24D 2220/00 Components of central heating installations excluding heat sources 2nd only +9 CPC CPC only CPC only
F24D 2240/00 Characterizing positions, e.g. of sensors, inlets, outlets 2nd only +9 CPC CPC only CPC only
F24D 3/00 Hot-water central heating systems (district heating systems F24D10/00; central heating systems using heat accumulated in storage masses F24D11/00) +1 CPC IPC+CPC Available in IPC and CPC
F24D 5/00 Hot-air central heating systems (district heating systems F24D10/00; central heating systems using heat accumulated in storage masses F24D11/00; air conditioning F24F); Exhaust gas central heating systems +1 CPC IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class F24,2013–2023, worldwide · Source: EPO PATSTAT

MIDEA 21,834
GREE ELECTRIC APPLIANCES 21,535
GUANGDONG MIDEA REFRIGERATION EQUIPMENT COMPANY 20,870
QINGDAO HAIER AIR CONDITIONER COMPANY 15,443
HAIER SMART HOME 15,442
QINGDAO HAIER AIR CONDITIONER ELECTRIC COMPANY 10,008
AUX AIR CONDITIONING COMPANY 7,723
NINGBO AUX ELECTRIC COMPANY 7,499
NINGBO FOTILE KITCHENWARE COMPANY 6,712
LG ELECTRONICS KR 6,441

Top Applicants (CPC)

Class F24,2013–2023, worldwide · Source: EPO PATSTAT

GREE ELECTRIC APPLIANCES 11,167
QINGDAO HAIER AIR CONDITIONER COMPANY 9,225
HAIER SMART HOME 8,998
MIDEA 8,874
GUANGDONG MIDEA REFRIGERATION EQUIPMENT COMPANY 8,724
LG ELECTRONICS KR 7,258
MITSUBISHI ELECTRIC CORPORATION JP 7,009
QINGDAO HAIER AIR CONDITIONER ELECTRIC COMPANY 6,104
BSH (BOSCH UND SIEMENS HAUSGERAETE) DE 3,544
NINGBO AUX ELECTRIC COMPANY 3,302