Solar water heating is a major application of solar thermal energy, but published totals often combine domestic hot water with space heating, industrial heat and district systems. The figures below keep those populations separate while showing the scale of deployment, technology mix, regional activity and measured outcomes.
Key Solar Water Heating Statistics
The most broadly useful figures include:
- 250 million dwellings used solar thermal water heating worldwide in 2020, according to an IEA/SHC estimate.
- 400 million dwellings are targeted for solar thermal water heating worldwide by 2030, under an IEA net-zero scenario.
- 290 million new systems are required worldwide from 2020 to 2030 to meet that scenario target, including decommissioning.
- More than 90% of global solar thermal consumption served domestic water heating in 2020, measured as a consumption share rather than a capacity share.
- Solar thermal systems produced an estimated 456 TWh of heat worldwide in 2023, across applications.
- Global solar thermal operation avoided an estimated 158.4 million tonnes of CO2 in 2023, based on displaced-fuel assumptions.
- Global solar thermal heating and cooling capacity reached an estimated 544 GW at the end of 2024, across a broader scope than domestic hot water.
- The 2024 global solar thermal capacity covered an estimated 777 million m² of collectors, across applications.
- Small-scale water-heating or combi systems represented about 60% of annual global installations reported for 2023, with combi systems also including space heating.
- Evacuated tubes accounted for 59% of new global solar thermal capacity in 2022, while flat plates accounted for 34%.
- Pumped systems represented 61% of new global solar thermal systems in 2022, compared with 39% for thermosiphon systems.
- China installed 15.0 GWth of new solar thermal capacity in 2022, across water and air collectors.
- Europe installed 3.0 GWth of new solar thermal capacity in 2022, across water and air collectors.
- Solar district heating comprised 336 systems worldwide in 2022, representing 1,908 MWth and 2.73 million m².
- At least 116 new SHIP plants were installed worldwide in 2023, adding 94 MWth of industrial process heat capacity.
- Solar thermal supported an estimated 345,000 jobs worldwide in 2022, across all solar thermal applications.
- Solar thermal industry turnover was estimated at €15.3 billion worldwide in 2022, equivalent to reported turnover of US$16.4 billion.
Contents
- Global solar water heating capacity, output and avoided emissions
- Solar water heating market trends and collector types
- Domestic hot-water solar thermal data by household type
- Regional solar water heating installation shares and growth
- Solar district heating and large-scale thermal systems
- Solar water heating jobs, industry value and outlook
Global Solar Water Heating Capacity, Output and Avoided Emissions
The broadest global series measures solar thermal heating and cooling rather than domestic water heating alone. At the end of 2024, global solar thermal heating and cooling capacity reached 544 GW, covering 777 million m² of collectors; the European Union represented 7.5% of that global capacity.
These are estimates from the Solar Thermal Energy in the European Union – 2025 Status Report, and the scope is broader than household hot-water systems: Solar Thermal Energy in the European Union – 2025 Status Report.
A separate modeled estimate puts worldwide solar thermal heat production at 456 TWh in 2023. The same source converts that yield to 49.1 million tonnes of oil saved and estimates 158.4 million tonnes of CO2 avoided, with the energy-equivalent and emissions figures dependent on displaced-fuel assumptions: Solar Heat Worldwide 2024.
The domestic-water-heating population is measured differently from installed capacity. An IEA/SHC estimate counted 250 million dwellings using solar thermal water heating worldwide in 2020, while a net-zero scenario targets 400 million dwellings by 2030.
That scenario requires 290 million new systems between 2020 and 2030, including decommissioning. Its allocation includes 170 million standard-technology systems and 120 million emerging-technology systems, so these figures are targets rather than observed deployment: Solar thermal technologies deployed in around 400 million dwellings by 2030.
Solar Water Heating Market Trends and Collector Types
Domestic hot water dominates solar thermal use in the historical IEA outlook. More than 90% of global solar thermal consumption served domestic water heating in 2020, and consumption was expected to increase by more than 4% in that outlook, with projected annual growth of 8% for 2021–2022; these are outlook estimates, not later measured results: Renewables 2020: Renewable heat.
The 2023 global installation mix also shows the importance of smaller systems. About 60% of annual installations were small-scale water-heating or combi systems, although the source includes combined space heating in the combi category: Solar Heat Worldwide 2024.
Collector and circulation technologies show meaningful regional differences:
| Measure | Period and geography | Share or volume |
|---|---|---|
| Evacuated tubes among new capacity | 2022, worldwide | 59% |
| Flat plates among new capacity | 2022, worldwide | 34% |
| Pumped systems among new systems | 2022, worldwide | 61% |
| Thermosiphon systems among new systems | 2022, worldwide | 39% |
The same 2022 series reports 73% evacuated tubes among new collectors in China, 95% in India, and 72% flat plates among installed collectors in Europe. The worldwide mix also changed over the longer revised series: evacuated tubes fell from 82% in 2011 to 59% in 2022, while flat plates rose from 15% to 34%; these are observed collector shares, not household adoption rates: Solar Heat Worldwide 2024.
PVT is a distinct technology from conventional solar water heating. Its market volume fell 51% in 2022 and 30% in 2023, according to the same global solar thermal reporting.
Domestic Hot-Water Solar Thermal Data by Household Type
Standardized reference tables provide a way to compare domestic hot-water systems by building type, but they are not a complete household census. At the end of 2022, the reported-country single-family reference series covered 46,591,044 m² and represented 679,322 systems.
The multi-family reference series was much larger by collector area and system count: 283,930,124 m² and 6,984,809 systems at the end of 2022. The two series should not be interpreted as a global household total because both are standardized reference estimates for reported countries.
Selected single-family reference areas were:
| Geography | Single-family DHW reference area, end-2022 |
|---|---|
| China | 300,079,598 m² |
| India | 17,358,208 m² |
| Brazil | 11,460,184 m² |
| Germany | 9,940,614 m² |
Selected multi-family reference areas were different in scale and building context:
| Geography | Multi-family DHW reference area, end-2022 |
|---|---|
| China | 254,784,564 m² |
| Germany | 2,686,456 m² |
| India | 1,908,575 m² |
| Denmark | 1,466,078 m² |
All four tables use the standardized domestic-hot-water reference estimates in Solar Heat Worldwide 2024. Collector area, system count and dwelling count measure different things, so they should not be added together or treated as interchangeable adoption rates.
Regional Solar Water Heating Installation Shares and Growth
Worldwide new solar thermal capacity totaled 22.7 GWth in 2022, corresponding to 32.5 million m² and including both water and air collectors. China and Europe accounted for most of this activity in the reported series.
| Geography | New capacity in 2022 | Share of reported new capacity |
|---|---|---|
| China | 15.0 GWth | 66.1% |
| Europe | 3.0 GWth | 13.0% |
| China and Europe combined | 18.0 GWth | 79% of installations |
The capacity figures and shares are from Solar Heat Worldwide 2024. Because the source describes broad solar thermal capacity, the table is not a domestic-hot-water-only ranking.
Market growth in 2023 varied sharply by country. India recorded 27% growth, South Africa 12%, and Mozambique 40%, while the global market declined 7%; these are market-growth measures, not necessarily changes in installed capacity or household participation.
Solar District Heating and Large-Scale Thermal Systems
Solar district heating extends solar thermal beyond individual household water heaters. In 2022, the worldwide stock comprised 336 systems, representing 1,908 MWth and 2.73 million m² of collector area.
These figures describe district heat, not household heater ownership. They are reported in Solar Heat Worldwide 2024, whose broader solar thermal scope also includes other applications.
Industrial process heat provides another large-system measure. At least 116 new SHIP plants—solar heat for industrial processes—were installed worldwide in 2023, adding 94 MWth.
The 2023 SHIP stock was estimated at approximately 1,200 systems, covering 1.4 million m² and representing 951 MWth. The stock estimate uses a minimum reporting threshold, so small plants may be missed: Solar Heat Worldwide 2024.
Solar Water Heating Jobs, Industry Value and Deployment Outlook
Economic measures also use the full solar thermal industry rather than domestic water heating alone. In 2022, solar thermal supported an estimated 345,000 jobs worldwide, while industry turnover was estimated at €15.3 billion, or a reported currency equivalent of US$16.4 billion.
Those figures cover all solar thermal applications and therefore should not be presented as the employment or revenue of household water-heater manufacturers alone: Solar Heat Worldwide 2024.
The European supply chain has its own indicators. EU manufacturing capacity exceeded 3,000 MWth in 2024, a manufacturing measure rather than installed capacity, while the EU extra-EU trade surplus was €16 million.
France exported about €170 million of solar water heaters in 2024, a trade value rather than an installed-capacity measure: Solar Thermal Energy in the European Union – 2025 Status Report.
Across these datasets, the clearest deployment outlook is the IEA scenario for 400 million solar-thermal dwellings by 2030. It remains a scenario target, while capacity, collector area, market growth, jobs, turnover and avoided emissions are separate measures with different populations, periods and assumptions.