iW Solar builds the iW-F pressurized and iW-FT non-pressurized flat panel solar water heaters in Taian City, Shandong Province — compact systems that pair a 150 L to 300 L tank with 1–2 flat plate collectors (2,000 × 1,000 × 80 mm). Sleek look, copper flow channels, long service life — B2B manufacturing and OEM & ODM for importers and distributors since 2013.
An integrative flat panel solar water heater is a compact system where a flat plate collector and a storage tank work together as one installation. Compared with evacuated-tube heaters, the flat panel version has a low-profile, elegant appearance that many homeowners prefer — and it is the natural choice wherever vacuum tubes are not wanted, for example in frost-prone or design-sensitive markets.
iW Solar manufactures the line in two versions on the same tank platform: the iW-F pressurized series (mains pressure, 0.6 MPa rated) and the iW-FT non-pressurized series (gravity flow, easiest to sell on price). Both use the same 2,000 × 1,000 × 80 mm flat plate collector with black chrome or blue film coating.
Six standard configurations: pressurized (SP-F) and non-pressurized (SN-FT), each in flat-roof (AS) and sloping-roof (S) mounting versions.
| Model | Flat plates | Net tank capacity | Mounting |
|---|---|---|---|
| SP-F-150AS / SN-FT-150AS | 1 pc | 150 L | Flat roof |
| SP-F-200AS / SN-FT-200AS | 1 pc | 200 L | Flat roof |
| SP-F-300AS / SN-FT-300AS | 2 pcs | 300 L | Flat roof |
| SP-F-150S / SN-FT-150S | 1 pc | 150 L | Sloping roof 15–30° |
| SP-F-200S / SN-FT-200S | 1 pc | 200 L | Sloping roof 15–30° |
| SP-F-300S / SN-FT-300S | 2 pcs | 300 L | Sloping roof 15–30° |
| Item | Specification |
|---|---|
| Rated pressure | 0.6 MPa (iW-F pressurized) / open-vented (iW-FT) |
| Inner tank material | SUS304 (SUS304-2B on pressurized version) |
| Outer tank material | Colour steel plate / stainless steel plate |
| Insulation | Polyurethane, high-pressure foaming |
| Flat plate collector | 2,000 × 1,000 × 80 mm |
| Coating | Black chrome / blue film |
| Collector material | Colour steel plate T1.2 / galvanized steel |
| Flow channels | Totally copper — low defect rate, easy maintenance, long service life |
| Backup heating | Electric heater with dry-heating and thermal cut-out protection |
| Quality control | Full-process inspection; tank pressure test; AQL 2.5 packing check; third-party inspection welcome |
Offer the flat panel version when your market values appearance, frost resistance or hail safety, or when local roofing styles favour a low-profile collector. Offer an evacuated-tube non-pressure heater when purchase price decides the sale in strong-sun markets.
The standalone collector behind this system is detailed on our flat plate solar collector page; for hard-freezing markets that need the tank indoors, step up to the split flat plate or see our heat pipe solar collector. For a side-by-side view of all main system types, read the different types of solar water heaters.
iW Solar is a B2B manufacturer, not a retail shop, so the heater is built around your business:
See the full solar water heater product range for the evacuated-tube, split and accessory options that complete a catalogue.
The iW-F is pressurized: its SUS304-2B tank works at 0.6 MPa and delivers mains-pressure showers. The iW-FT is non-pressurized and vented, delivering gravity flow at the lowest cost. Both share the same tank platform, flat plate collector and copper flow channels.
Flat panels are more forgiving in frost and hail-prone areas and there is no tube to break. For hard-freezing winters we still recommend a split system with the tank indoors — we will advise honestly which configuration fits your market.
The waterways in the collector are made entirely of copper, which achieves a low defect rate, easy maintenance and a long service life — it is one of the defining quality points of this series.
A reliable electric heater with protection against dry heating and thermal cut-out provides backup, managed by the intelligent controller with automatic water filling.
Yes. Logo printing on the outer tank, collector frame and cartons is a standard OEM service, and the outer tank can be finished in colour steel or stainless steel to your market preference.
MOQ starts from 1 set for market testing. Production takes 18–25 working days after order confirmation, and we reply to every enquiry within 12 hours.
Tell us your target market, target retail price and estimated annual quantity. Our engineers will come back with the right configuration, and 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.