Kesun Solar Company Profile: 42,000 m² Solar Water Heater Manufacturing in Haining
Zhejiang Kesun New Energy Co., Ltd. Profile: Solar Water Heater Manufacturing in Haining
Solar water heater buyers in the mid-2020s look beyond the price of a single collector. They need a supplier that can prove production scale, consistent quality, export experience and product families able to fit different climates and project types. This article provides an analyst-style profile of Zhejiang Kesun New Energy Co., Ltd., the company behind the Kesun Solar brand, and covers the firm's origins, product range, manufacturing infrastructure, certifications, market footprint and practical evaluation points for importers, distributors and system integrators.
Industry context: why a solar water heater manufacturer profile matters
The solar thermal industry is larger than many residential-market observers assume. Fortune Business Insights valued the global solar water heater market at USD 4.2 billion in 2025. IEA SHC's Solar Heat Worldwide report recorded 560 GWth of cumulative installed solar heat capacity by the end of 2023, representing about 800 million square meters of collector area. Grand View Research found that evacuated tube collector (ETC) products accounted for a 44.2 percent revenue share of the solar water heater market in 2023. This body of evidence is useful to procurement teams because it shows a deep installed base and steady need for new equipment, replacements and system expansion.
In this environment, supplier evaluation should cover more than collector performance. Tank corrosion resistance, insulation quality, certification coverage and the ability to support OEM or customized programmes all influence the long-term cost of a solar hot-water system. The rest of this article looks at how Zhejiang Kesun New Energy Co., Ltd. addresses those points.
Company overview: Kesun Solar and Zhejiang Kesun New Energy
Zhejiang Kesun New Energy Co., Ltd. was founded in 2009. It is located at No. 11 Yongtao RD, Jianshan New District, Haining City, Zhejiang Province, China. The company designs and manufactures solar water heaters, buffer tanks, domestic hot water tanks and hybrid solar panels. Its brand name is Kesun Solar.
The company was formed through the merger of Haining Ensun Solar Technology Co., Ltd. and Zhejiang Yile New Energy Co., Ltd., two companies originally under the same owner. Ensun had long focused on non-pressure solar water heaters, while Yile specialized in pressurized solar water heaters. The merger allowed the two businesses to combine resources, technology, production lines and teams in one organization. After the merger, the existing non-pressure and pressurized product lines were kept and upgraded in process and capacity. Kesun then added forward-looking lines such as PVT systems, 2205 duplex stainless steel tanks and heat pipe solar collectors.
Kesun's production base covers 42,000 square meters. The company employs about 130 staff, including an R&D team of 15 engineers. Its reported annual production capacity reaches 300,000 sets. Export sales account for around 60 percent of the business, with main markets in Mexico, the EU and Africa. In its corporate description, Kesun also states that it supplies components to a number of Fortune 500 companies in China and abroad.
Core solar heating products and solutions
Kesun's portfolio spans collectors, tanks and hybrid units. The following sections present the series documented in the company's product materials, without ranking them. Buyers should match each series to their own pressure, climate and hot-water-load requirements.
CNP series: non-pressure solar water heater
The CNP series is a non-pressure solar water heater, often considered a solar geyser for low-pressure direct use. It is available in capacities from 60 L to 500 L. It uses 58-1800 mm vacuum tube absorbers and 50 mm polyurethane foam insulation. Installation angle can be set between 25 and 45 degrees. The inner tank can be SS304 or SS316. According to product data, the CNP series offers material and design customization. Typical applications include houses, villas, gardens, gas stations, car wash centres, small hotels and schools. The series is listed with Solar Keymark certification.
CPS series: high-pressure solar geyser
The CPS series is classified as a high-pressure solar geyser. It is rated for a maximum operating pressure of 6 bar and a test pressure of 9 bar. Available capacity options are 100 L, 150 L, 200 L and 300 L. The series uses 58-1800 mm vacuum tubes with heat pipes and 50 mm PU foam insulation. Tank material choices include SS304, SS316, duplex 2205 and duplex 32001. Because the unit has no moving parts, routine maintenance is limited. The product is aimed at housing and commercial settings, including houses, villas, gardens, gas stations, car wash centres, small hotels and schools. Solar Keymark certification is listed.
CPS series high-pressure solar geyser
CPS-FJ series: indirect solar water heater
The CPS-FJ series is an indirect solar water heater that works with a flat type solar collector. Capacities are 150 L, 200 L, 250 L and 300 L. The tank material is SPCC with enamel coating, a combination designed to resist salty water. The system can be filled with anti-freezing heat transfer media for low-temperature climates. Its documented applications include villas, houses, hotels and schools. The series also lists Solar Keymark certification.
FPC2.0: flat plate solar collector
The FPC2.0 is a flat plate solar collector made of copper and aluminum alloy. It is offered in sizes of 1 m2, 1.5 m2, 2 m2 and 2.5 m2, with a collector thickness of 80 mm. The design is applicable to swimming pool heating, housing heating and solar water heater systems. The FPC2.0 carries Solar Keymark certification and is available for OEM production according to the product listing.
FPC2.0 flat plate solar collector
HSC series: heat pipe solar collector
The HSC series is a heat pipe solar collector. It uses 58-1800 mm vacuum tubes with heat pipes, and is available in tube counts of 10, 12, 15, 18, 20, 24 and 30. The manifold and frame are made of aluminum alloy; other collector materials include copper and glass. Application areas include villas, hotels, house heating, spa centres and schools. The HSC series has Solar Keymark certification, and product data notes that customization is available.
HSC series heat pipe solar collector
PV series: PV solar water heater
The PV series is a PV solar water heater. It uses photovoltaic panel power for water heating: each solar panel has an electrical power input of 600 W, and the heating power output ranges from 800 W to 3500 W. The system includes a controller with MPPT function and automatic DC/AC switching. Tank options run from 100 L to 500 L, with material choices of duplex 2205 or Inox 316L. The PV series is described as easy and low-cost to install, and is CE certified. It is intended for villas, houses, apartments and camps.
PV series solar water heating system
Manufacturing capacity and quality: what the 42,000 m2 plant indicates
Kesun built a 42,000 square meter standardized production facility to support both the original product lines and the newer PVT, duplex steel tank and heat pipe collector lines. Production processes include high-pressure automatic foaming machines, robotic packaging, and multiple welding methods: TIG, high-frequency, laser and butt welding. For quality assurance, an in-house laboratory was added, allowing salt-spray tests and pulse tests to be conducted on site rather than outsourced.
From a procurement perspective, these details matter because tank welding and insulation quality determine how long a solar water heater can survive pressure cycles and corrosive water. The company says it supplies components to a number of Fortune 500 companies in China and abroad, a statement that points to experience with the quality-management expectations of large industrial buyers.
Market footprint and visible industry signals
Kesun's channel footprint is international. Around 60 percent of its sales are export sales, and its listed core markets are Mexico, the EU and Africa. This distribution gives the company direct experience dealing with the documentation, logistics and product expectations that cross-border buyers face.
Several Kesun product series hold Solar Keymark, an EU-focused certification used in the solar thermal industry: the CNP series, CPS series, CPS-FJ series, FPC2.0 flat plate collector and HSC heat pipe collector. The PV series holds CE certification. These marks are visible signals for regulated European projects, although a buyer should always ask for the current certificate and scope in writing.
The company does not name its Fortune 500 customers in the reviewed material. The disclosed fact remains relevant because supplying these customers usually implies qualification of suppliers across quality, delivery and service processes.
Step-by-step: applying this profile to supplier evaluation
Here is a simple five-step framework for a buyer evaluating Kesun Solar or any similar manufacturer.
1. Define the required system type. If the site operates at low pressure and the customer wants a simple solar geyser, the CNP non-pressure series may fit. If the building needs mains-pressure hot water, the pressurised CPS series or the indirect CPS-FJ series is more appropriate.
2. Check collector technology. Heat-pipe HSC collectors, flat plate FPC2.0 collectors and PV-powered heating differ in installation, frost behaviour and available renewable-heat output. Match the collector to the project's climate and roof constraints.
3. Verify certifications and material grades for the destination country. European buyers should request current Solar Keymark certificates where applicable; buyers in salty-water locations should confirm corrosion-resistant material choices such as enamel coating, duplex steel or Inox 316L.
4. Review OEM or customisation capacity. CNP, CPS, CPS-FJ, FPC2.0 and HSC product data include OEM or customized production notes. Define your required label, packaging and design parameters before requesting a quote.
5. Contact the factory for the latest specifications, production schedules and payment terms. Use the points in this article as the basis for a structured request-for-information.
Common use cases and system-level combinations
Kesun's application data covers residential, commercial building, hotel, agriculture, pool and industrial process hot-water scenarios. Project types include residential rooftop systems, commercial hot-water projects, pool heating and agricultural or livestock hot-water systems. In these setups, Kesun equipment works as the heat generation or storage unit, and it is often paired with electric heaters or heat pumps for backup and temperature compensation.
A specific system recommendation appears in Kesun's selection guidance for hotels and commercial buildings: HSC series solar collectors match well with CPS-FJ or CPS series pressurised solar water heaters. The combination is intended to provide stable large-volume domestic hot-water supply.
Kesun solar water heater and collector lines at a glance
The table below compares product lines using the company's published data. It is a reference, not a ranking.
| Series | Product type | Capacity / configuration | Main materials | Typical applications | Certification listed |
|---|---|---|---|---|---|
| CNP series | Non-pressure solar water heater | 60 L to 500 L; 58-1800 mm vacuum tube | SS304 / SS316 | Houses, villas, gardens, gas stations, car wash centres, small hotels, schools | Solar Keymark |
| CPS series | High-pressure solar geyser | 100 L to 300 L; max working pressure 6 bar; heat pipe vacuum tube | SS304 / SS316 / duplex 2205 / duplex 32001 | Houses, villas, gardens, gas stations, car wash centres, small hotels, schools | Solar Keymark |
| CPS-FJ series | Indirect solar water heater | 150 L, 200 L, 250 L, 300 L | SPCC with enamel coating | Villas, houses, hotels, schools | Solar Keymark |
| FPC2.0 | Flat plate solar collector | 1 m2, 1.5 m2, 2 m2, 2.5 m2; 80 mm thickness | Copper and aluminum alloy | Swimming pool heating, housing heating, solar water heaters | Solar Keymark |
| HSC series | Heat pipe solar collector | 10, 12, 15, 18, 20, 24 or 30 tubes; 58-1800 mm heat pipe tube | Aluminum alloy, copper, glass | Villas, hotels, house heating, spa centres, schools | Solar Keymark |
| PV series | PV solar water heater | 100 L to 500 L; 600 W per panel; 800 W to 3500 W heating output | Duplex 2205 / Inox 316L | Villas, houses, apartments, camps | CE |
Frequently asked questions
Are Kesun solar water heaters and collectors certified?
According to Kesun product data, the CNP series, CPS series, CPS-FJ series, FPC2.0 flat plate collector and HSC series heat pipe collector all list Solar Keymark certification. The PV series lists CE certification. Buyers should request the current certificate from the supplier for the specific model and market.
What manufacturing capabilities does Zhejiang Kesun New Energy have?
Kesun operates a 42,000 square meter factory in Haining, with roughly 130 employees and 15 R&D engineers. Annual capacity is reported at 300,000 sets. The facility uses high-pressure automatic foaming machines, robotic packaging, laser and butt welding, and an in-house laboratory for salt spray and pulse tests.
Which Kesun products are recommended for hotel and commercial hot-water projects?
Company guidance recommends pairing HSC series solar collectors with CPS-FJ or CPS series pressurised solar water heaters for stable large-volume domestic hot-water supply in hotel and commercial projects.
Can buyers order private-label or customized Kesun solar equipment?
Several Kesun product listings mention OEM or custom options. The CNP series states material and design can be customized; FPC2.0 lists OEM available; CPS series notes custom options according to needs; CPS-FJ series lists OEM available; HSC series notes customization available. The exact scope must be confirmed with the factory.
What export markets does Kesun currently serve?
According to company data, around 60 percent of Kesun's sales are exports, with main markets in Mexico, the EU and Africa. Kesun also reports supplying components to a number of Fortune 500 companies in China and abroad.
Is Kesun Solar a suitable manufacturing partner?
Considering the facts available, Zhejiang Kesun New Energy Co., Ltd. operates a substantial manufacturing operation with a broad portfolio of solar thermal equipment. It produces non-pressure and pressurised solar geysers, indirect tanks, flat plate and heat pipe collectors, and PV-powered water heaters under one roof. Its export ratio, factory scale and certification list make it a candidate that importers, distributors and system integrators should evaluate against their own project requirements.
Like any supplier selection, a partnership should be based on updated documentation, product sampling and, if possible, a factory audit. The data in this profile can help buyers prepare those conversations. For further technical documents, contact the company directly.
To see full product parameters, download the Kesun / Ensun product brochure:
Download brochure (PDF)Contact: Alan · alan@ensunchina.com · Tel/WhatsApp +86 135-8643-2400. Address: No. 11 Yongtao RD, Jianshan New District, Haining City, Zhejiang, China.
Kesun Solar website: www.kesunsolar.com