Flexible Solar Hose 316L–Single & Twin Pre-Insulated for Solar Water Heating Systems

316L Single and Twin flexible solar hose with pre-insulated design for fast and secure solar hot water installations. Made from corrosion-resistant stainless steel, this flexible solar hose ensures easy connection between solar collectors and storage tanks—saving time, reducing heat loss, and improving system efficiency. Ideal for pressurized solar water heating systems.

Riwatt pre-insulated flexible solar hoses Introduction：

Riwatt Pre-Insulated Flexible Solar Hose requires just one step to complete solar water heater pipe installation.
Our pre-insulated flexible stainless steel solar hose is equipped with high-temperature EPDM insulation, durable jacketing protection, and a pre-assembled 2-core temperature sensor cable—making it the ideal choice for any solar thermal system. It enables quick and reliable connections between solar collectors, the pump station, and the water tank—no welding required!
The system is lightweight, space-saving, and easy to handle, even in confined areas. Flow and return pipes are clearly marked for simple identification. The smart break-point design allows installers to separate twin pipes into two single pipes without damaging the jacketing, perfectly meeting different installation needs.

316L Single and Twin Pre-insulated Flexible Solar Hose Structure:

● Twin flexible solar hose: It consisting of high temperature resistance EPDM insulation, 2 x flexible corrugated stainless steel tubes (feed and return), UV-resistant, Silicone-sensor line, seamless jacketing protection.
● Single flexible solar hose:It Consisting of high temperature resistance EPDM insulation, 1 x flexible corrugated stainless steel tube, UV-resistant, seamless jacketing protection.
● Single flexible solar hose with Temperature Sensor Cable It Consisting of high temperature resistance EPDM insulation, 1 x flexible corrugated stainless steel tube (feed and return), UV-resistant, Silicone-sensor line, seamless jacketing protection.

Pre-insulated Flexible Solar Hose Features:

The RIWATT Twin Solar Hose is specially engineered for solar thermal systems and solar water heating applications, providing reliable, high-efficiency, and long-lasting performance.

Innovative Design

Each coil integrates both feed and return lines for convenient installation. The sensor cable is positioned along one side of the twin hose, making it easy to distinguish between the supply and return pipes.

Premium Stainless Steel Tubing

Crafted from high-grade 316L (or 304) stainless steel, the hose ensures superior corrosion resistance and durability.

● Working pressure: up to 17.5 bar
● Burst pressure: 200 bar
● Heat treatment: 1050°C annealing for maximum flexibility and strength
● Safety standard: Food-grade quality material

100% Genuine EPDM Insulation

The insulation layer is made from closed-cell synthetic EPDM rubber, completely PVC-free and CFC-free, providing:

● Outstanding ozone resistance and UV protection
● Lightweight and flexible design
● Working temperature: -200°C to +150°C (maximum 175°C)

UV-Resistant Protective Jacketing

The insulation is coated with a high-density polyolefin copolymer foil for superior outdoor protection:

● Exceptional UV resistance (tested for 500 hours)
● Waterproof and weatherproof
● Tear-resistant and bird-peck resistant for long-term reliability

Versatile Coil Options

Available in 10m, 15m, 20m, 30m, and 60m coils.
Custom lengths can be produced upon request to suit your installation needs.

Easy and Cost-Saving Installation

● No soldering required – simple, secure connections
● Twin pipes can be easily separated into two single pipes when needed
● Saves time, labor, and installation costs while ensuring fast, reliable setup

✅ Ideal for: Solar water heating systems, solar thermal collectors, and solar hot water installations.
✅ Key Benefits: Save time, space, and labor costs with fast, easy, and durable connections.

Pre-insulated Flexible Solar Hose Features Advantages:

●  Flexible Design: High-quality 316L/304 stainless steel corrugated pipes bend easily by hand for quick installation.
●  High-Temp Sensor Cable: Silicone insulation works reliably up to 200°C.
●  Durable EPDM Insulation: UV, heat, and weather-resistant for long-term outdoor use.
●  Easy Connection: Fits all solar heating system components — no soldering or welding required.
●  Long Service Life: High-grade materials ensure lasting performance in all climates.
●  Versatile Use: Suitable for indoor and outdoor solar water heating applications.

Pre-insulated Flexible Solar Hose Illustration:

Pre-insulated Flexible Solar Hose Accessories:

316L Single and Twin Pre-insulated Flexible Solar Hose Packing:

The RIWATT 316L Single and Twin Pre-insulated Flexible Solar Hose is securely packed to ensure safe transport and easy handling.

Standard Packing Details:

●  Supplied in coil form: 10m, 15m, 20m, 30m, or 60m per roll
●  Each coil is individually wrapped with protective film and packed in a strong carton box
●  Sensor cable and fittings included (optional, per order)
●  Custom lengths and packaging available upon request

✅ Designed for safe delivery, easy storage, and quick installation on-site.

We take: DN25, with interiro Dia.: 26mm. and Outer Dia. 32mm , with 20mm thickness insulation, for Frence market as example:

●  25 meter per package
●  each package: 114cm*114cm*33cm，
●  each package: 33kgs

For Instance, if client will buy : 1000M

●  Then 1000m will be:40 boxes
●  total:0.4288*40=17.15CBM/1320KGS

if all specification keep the same, BUT change the EPDM insulation thickness from 20mm to 13mm:

Then the packing and weight info. will be as below:

●  25 meter per package
●  each package: 96cm*96cm*26cm，
●  each package: 26kgs
●  1000m will be:40 boxes
●  total:0.239*40=9.58CBM/1040KGS

Application – 316L Single and Twin Pre-insulated Flexible Solar Hose

The RIWATT 316L Single and Twin Pre-insulated Flexible Solar Hose is designed for efficient and reliable performance in solar thermal and solar water heating systems.

Applications include:

●  Solar collector to storage tank connections
●  Pressurized solar water heater installations
●  Solar pump station and controller connections
●  EVI heat pump water heater and space heating system
●  Hot water circulation and return lines
●  Commercial and residential solar heating systems
●  Indoor or outdoor solar piping installations
●  Solar hot water systems
●  Solar heating systems
●  Heat pump connections
●  Air conditioning technology

✅ Suitable for indoor, outdoor, or underground piping installations, providing high flexibility, corrosion resistance, and long-term durability for all solar thermal applications.
✅ Ideal for quick installation, high-temperature resistance, and long-term durability in all solar hot water setups.