iW Solar produces four heat pipe solar collector series in Taian City, Shandong Province — iW-HP, iW-H24, iW-HD and iW-HM — from 10 to 30 tubes per unit, rated 0.6 MPa and anti-freezing down to −35 °C. No water passes through the tubes, so one cracked tube never drains the system. B2B manufacturing and OEM & ODM since 2013.
A heat pipe solar collector is an evacuated tube collector with a sealed copper heat pipe inside each tube instead of water. Sunlight heats the vacuum tube, an aluminium fin passes the heat to the heat pipe, the working fluid inside evaporates and rises to the condenser at the top, and there it releases its heat to the water or glycol flowing through the copper manifold. The condensed fluid returns to the bottom of the pipe by gravity and the cycle repeats.
Because no water ever enters the tube, a broken tube does not drain your system — you simply swap the tube and the rest keeps running. That one difference is why heat pipe collectors dominate commercial projects and markets with freezing winters.
iW Solar manufactures four heat pipe series — iW-HP, iW-H24, iW-HD and iW-HM — in sizes from 10 to 30 tubes per collector, and sizes the system to your project rather than asking you to fit ours.
iW-HP series (SC-HP-10 to SC-HP-30). Output figures are at 1,000 W/m² irradiance.
| Model | Vacuum tubes | Aperture area | Gross area | Output |
|---|---|---|---|---|
| SC-HP-10 | 10 pcs | 1.0 m² | 1.56 m² | 620 W |
| SC-HP-15 | 15 pcs | 1.5 m² | 2.30 m² | 870 W |
| SC-HP-18 | 18 pcs | 1.8 m² | 2.74 m² | 1,047 W |
| SC-HP-20 | 20 pcs | 2.0 m² | 3.04 m² | 1,165 W |
| SC-HP-24 | 24 pcs | 2.4 m² | 3.63 m² | 1,401 W |
| SC-HP-25 | 25 pcs | 2.5 m² | 3.77 m² | 1,457 W |
| SC-HP-30 | 30 pcs | 3.0 m² | 4.51 m² | 1,748 W |
| Item | Specification |
|---|---|
| Vacuum tube | Φ58 × 1,800 mm, high borosilicate glass 3.3 (iW-HM: Φ70 × 2,000 mm) |
| Heat pipe | Φ14 / 1,700 mm red copper (iW-H24: Φ24 / 1,700 mm) |
| Insulation | Polyurethane foaming / rock wool, 40 mm (iW-H24: 55 mm) |
| Rated pressure | 0.6 MPa |
| Manifold | High-quality copper, testing pressure 1 MPa; aluminium alloy casing and bracket |
| Working temperature | Down to −35 °C, anti-freezing |
| Roof type | Flat and sloping roofs |
| Net weight | 38.25 – 98.7 kg depending on model |
| Quality control | Full-process inspection; manifold pressure tested to 1 MPa; AQL 2.5 packing check; third-party inspection welcome |
Not sure how heat pipe compares with the U pipe design? Read our comparison of heat pipe and U pipe solar collectors for the trade-offs in efficiency, freeze resistance and cost.
Heat pipe solar collectors fit best where reliability in cold weather or continuous operation matters: residential pressurised systems, hotels and hospitals, schools and dormitories, industrial process hot water, and split systems where the tank is installed indoors. Where frost is rare and appearance or budget leads the decision, compare them with our flat plate solar collectors and non-pressure solar water heaters. For swimming pool heating and large commercial installations we supply engineered system solutions — see the full solar water heater product range.
iW Solar is a B2B manufacturer, not a retail shop, so the collector is built around your business:
Nothing drains and the rest of the collector keeps working, because the water never flows through the tubes. You replace only the broken tube, which takes a few minutes.
Yes. The design is anti-freezing down to −35 °C, and since there is no water inside the tubes there is nothing to freeze and burst.
Yes. The collector is rated for 0.6 MPa working pressure and the copper manifold is tested to 1 MPa, so it pairs with pressurised tanks, split systems and heat pumps.
It depends on daily hot water consumption and the solar radiation in your market. As a reference, our collectors deliver 620–2,098 W per unit. Send us your project details and we will size it for you at no cost.
Every collector passes full-process inspection on the line, and the copper manifold is pressure tested to 1 MPa before assembly. Packing is inspected to AQL 2.5, and you are welcome to send a third-party inspector to our factory or nominate a lab for testing.
MOQ starts from 1 set for market testing. Production takes 18–25 working days after order confirmation, and we reply to enquiries within 12 hours.
Tell us your market, project type and estimated annual quantity. Our engineers will recommend the right series — iW-HP, iW-H24, iW-HD or iW-HM — and come back with a price within 12 hours.
Request a quotation See all solar water heater productsCompetitive pricing, exceptional quality — get a factory quote within 12 hours.
If you are looking for an experienced and reliable factory for your OEM custom solar water heaters and bespoke solar equipment in China, iWSOLAR is your best choice. We offer the most reasonable price with the finest quality to support your business.