F24H 1/00
Water heaters
Official title: Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters (steam boilers F22B)
F24H1/00 (Water heaters) appears on 3,601 US grants and 3,576 published applications in this corpus.
Search patents in F24H- Granted patents
- 3,601
- Published applications
- 3,576
- Assignees
- 1,605
- Inventors
- 6,619
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 35 | 0 |
| 1977 | 29 | 0 |
| 1978 | 29 | 0 |
| 1979 | 33 | 0 |
| 1980 | 31 | 0 |
| 1981 | 43 | 0 |
| 1982 | 41 | 0 |
| 1983 | 58 | 0 |
| 1984 | 66 | 0 |
| 1985 | 46 | 0 |
| 1986 | 46 | 0 |
| 1987 | 46 | 0 |
| 1988 | 51 | 0 |
| 1989 | 71 | 0 |
| 1990 | 74 | 0 |
| 1991 | 47 | 0 |
| 1992 | 40 | 0 |
| 1993 | 48 | 0 |
| 1994 | 48 | 0 |
| 1995 | 44 | 0 |
| 1996 | 50 | 0 |
| 1997 | 32 | 0 |
| 1998 | 55 | 0 |
| 1999 | 60 | 0 |
| 2000 | 70 | 0 |
| 2001 | 52 | 10 |
| 2002 | 46 | 40 |
| 2003 | 57 | 48 |
| 2004 | 43 | 56 |
| 2005 | 62 | 64 |
| 2006 | 43 | 72 |
| 2007 | 32 | 69 |
| 2008 | 40 | 67 |
| 2009 | 32 | 112 |
| 2010 | 54 | 118 |
| 2011 | 43 | 116 |
| 2012 | 60 | 134 |
| 2013 | 66 | 167 |
| 2014 | 98 | 195 |
| 2015 | 97 | 191 |
| 2016 | 113 | 191 |
| 2017 | 154 | 157 |
| 2018 | 142 | 218 |
| 2019 | 176 | 216 |
| 2020 | 173 | 245 |
| 2021 | 148 | 216 |
| 2022 | 189 | 210 |
| 2023 | 159 | 157 |
| 2024 | 127 | 177 |
| 2025 | 117 | 202 |
| 2026 | 85 | 128 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F24H 1/18Water-storage heaters1,303
- F24H 1/10Continuous-flow heaters, i.e. heaters in which heat is generated only while the1,243
- F24H 1/22Water heaters other than continuous-flow or water-storage heaters834
- F24H 1/0027Water heaters: using fluid fuel183
- F24H 1/0072Special adaptations155
- F24H 1/48Water heaters for central heating incorporating heaters for domestic water121
- F24H 1/06Portable or mobile116
- F24H 1/0018Water heaters: using electric energy supply115
All 14 subgroupsShow fewer
- F24H 1/08Packaged or self-contained boilers, i.e. water heaters with control devices and pump94
- F24H 1/54Water heaters for bathtubs or pools48
- F24H 1/46Water heaters having plural combustion chambers22
- F24H 1/0009Water heaters: of the reduced pressure or vacuum steam type12
- F24H 1/0054Gas- or oil-fired immersion heaters for open containers or ponds9
- F24H 1/0063Water heaters: using solid fuel9
Recent patents
- Water heater having highly efficient and compact heat exchanger6 Oct 2026US RE51,053 E1A. O. Smith Corporation
- Hot water storage tank29 Sep 2026US 12,747,891 B2Mitsubishi Electric Corporation
- Electric fluid heater22 Sep 2026US 12,742,569 B2Digital Heat Ltd.
- Heater bundles having variable power output within zones22 Sep 2026US 12,742,570 B2Watlao Electric Manufacturing Company
- Heater and heating pool15 Sep 2026US 12,736,254 B2Oriental Recreational Products (Shanghai) Co., Ltd
- Premixing device and combustion device comprising same8 Oct 2026US 2026/0309326 A1Noritz Corporation
- Flow Through Heaters and Methods of Manufacture Thereof8 Oct 2026US 2026/0309364 A1Otter Controls Limited
- Pressurized tankless boiler system and appartus8 Oct 2026US 2026/0309365 A1Phoenix Heating Services
- Heating device for a steam generator8 Oct 2026US 2026/0309366 A1Yuyao Hengxi Technology Co., Ltd.
- Baffle for condensing flue tubes within a water heating appliance8 Oct 2026US 2026/0309367 A1Bradford White Corporation
Most cited
By later US patents
- In-line fluid heating apparatus with gradation of heat energy from inlet to outlet313US 5,381,510 AIn-Touch Products Co. · 1995
- Thermal treatment apparatus310US 5,549,559 AArgomed Ltd. · 1996
- Parenteral fluid warmer apparatus and disposable cassette utilizing thin, flexible heat-exchange membrane291US 5,245,693 AIn-Touch Products Co. · 1993
- Window cleaning fluid heating system having timer-controlled heater and differential input circuit280US 5,354,965 AGensonic, Inc. · 1994
- Self-regulating porous heater device180US 4,794,226 AMetcal, Inc. · 1988