Start With the Application
| Application | What decides the choice | Where Ridgeline fits | Evidence to check |
|---|---|---|---|
| Domestic hot and cold water | Water-contact materials, approval scope, service conditions, flow and accessible connections | Flexible 316L tube with the selected P1 or RidgeLock connection system | Current certificate schedule, tube/fitting sizes and installation instructions |
| Long or concealed distribution routes | Actual route length, bend requirements, support, protection and location of joints | Continuous corrugated tube where routing reduces the need for intermediate fittings | A route drawing and fitting schedule for each proposed system |
| Heat-pump flow and return | Required flow, complete circuit pressure loss, available pump head, insulation and outdoor protection | Appropriately sized Ridgeline tube for the designed flow and return route | Product-specific hydraulic data and the heat-pump manufacturer's requirements |
| Underfloor heating | Room heat loss, floor build-up, covering, pipe spacing, circuit length and manifold duty | Ridgeline Underfloor Pro-FAST 15, Pro-FAST 17 or Eco-MAX selected for the design | Underfloor datasheet and the complete thermal/hydraulic calculation |
| Final flexible connections | End fittings, bore, length, movement, service temperature and model-specific approval | A selected Ridgeline Flexis connector | The individual model row and supporting certificate or component basis |
For detailed potable-water selection, use the drinking-water material guide. For certification scope, use the WRAS and Kiwa guide.
Compare Complete Systems Fairly
Push-fit and press-fit describe connection methods. They are not pipe materials. A useful comparison names both the tube and the compatible fitting system, including seals, inserts and installation requirements.
| System | Practical reason to consider it | What to check on the project |
|---|---|---|
| Copper | Familiar material for repairs, visible runs and many domestic water/heating installations; bends can be formed where appropriate | Water/service compatibility, joining method, tools, joint access, insulation and the actual fitting count |
| PEX or PB system | Flexible polymer pipe supplied in lengths/coils, with system-specific fittings for applicable services | Exact product approval, temperature/pressure duty, supports, expansion, inserts and the barrier requirement for heating |
| MLCP | Multilayer pipe combining polymer layers and a metal layer; bendable routes with a compatible connection system | Actual bore, bending limits, tooling, complete-system compatibility and approved service conditions |
| Rigid stainless steel | Stainless tube with system-specific connections for designed building-services routes | Fitting system, tooling, service conditions and the route's bends/support requirements |
| Ridgeline corrugated 316L stainless steel | Flexible stainless tube for long routes, with dedicated P1 or RidgeLock connections and application-specific product families | Corrugated-tube pressure-loss data, permitted bends, supports, selected fitting/size and the relevant approval schedule |
These categories contain different products and specifications. A material-level comparison cannot certify an individual installation or establish that one system is cheapest or quickest on every route.
Which Plumbing Systems Can Be Installed Without a Press Tool?
Push-fit, conventional compression and corrugated stainless systems use different joining methods. Compare the tools needed, permitted pipe and fitting combinations, and access for completing each joint. Flexible pipe also needs a route and bend-radius check; hydraulic sizing and support requirements still apply.
With Ridgeline corrugated 316L stainless tube and RidgeLock, a complete sealing-ring assembly replaces the copper olive in a WRAS-approved EN 1254 compression fitting. A tube cutter, knife and spanners are needed. RidgeLock is available for R-15, R-22 and R-28; keep its scope separate from P1 mechanical fittings.
The R-22 installation film shows tube preparation, ring position and tightening, with a direct link to each step. Use the current installation instructions and approval scope for the exact assembly.
What Is in Contact With the Water?
Ridgeline tube presents a 316L stainless steel water-contact surface. Its protective PE sleeve is outside the tube. That describes the tube, not every component of a completed plumbing system: fittings, seals, valves and connected equipment must be assessed separately. An assembly may include elastomer seals such as EPDM.
If the brief is to avoid polymer tube in the drinking-water path, stainless steel tube is a relevant option. Do not turn that preference into an unsupported claim that approved plastic systems are unsafe, or that the entire installed system contains no polymers. Specify the actual wetted materials and required evidence.
Does Flexible Pipe Mean Fewer Concealed Joints?
It can, when the route permits a continuous run. The useful measure is the number and location of joints in the proposed installation. Compare the same start/end points, bends, branches, isolation points and accessible termination positions for each system.
- Draw the actual route, including obstacles and changes of level.
- Identify which bends can be formed in each selected pipe within its installation limits.
- Count intermediate fittings and mark which would be concealed after finishes are installed.
- Keep required branches, valves and service access in the comparison.
- Price the actual materials, tools and installation tasks against that drawing.
Fewer concealed joints can simplify inspection and future access planning. A joint count is not a measured leak rate or a guarantee against failure. Correct preparation, connection, protection and commissioning remain essential. The concealed fittings guide explains the route comparison in more detail.
Design Heat-Pump and Underfloor Circuits Separately
A shared material does not make every circuit interchangeable. Heat-pump flow and return must deliver the required flow within the available pump head. Corrugated tube must be evaluated using the relevant pressure-loss data; nominal size alone is not proof of equivalence to copper, PEX or MLCP. Include both legs, fittings, valves, fluid conditions and other circuit components.
Use the flexible heat-pump routing guide for an awkward route and the ASHP sizing guide for sizing inputs and the calculator workflow.
For underfloor heating, the floor build-up and covering, room heat loss, spacing, circuit length and flow/return temperatures determine the design. Stainless tube does not by itself establish a fixed heat-output, energy-saving or heat-pump efficiency improvement. The underfloor selection guidance links the product data and questions needed for a project comparison.
Check the Selected Certificate and Assembly
Ridgeline's P1 and RidgeLock systems have different certificate schedules. Check the current document for the exact tube, fitting, seal, size and service conditions being proposed. Do not transfer an approval or pressure/temperature limit from one connection system to another.
Use the P1 Kiwa Regulation 4 certificate, RidgeLock Kiwa certificate and current technical library. For final connections, the Flexis model selector distinguishes the status and evidence for each model.
Manufacturer mechanical ratings, water-regulation certification and warranty conditions answer different questions. None removes the need to design and install the selected assembly correctly.
Compare Installed Cost on the Same Basis
A price per metre leaves out fittings, preparation, tools, insulation, supports and labour. Compare quotations using the same route and design duty. Record the assumed labour rate and tasks, material quantities, accessible connection positions and any future access requirements. Treat estimates as estimates until project records substantiate them.
Ridgeline may be particularly useful where a continuous stainless route replaces several intermediate connections. A short repair in an existing system may favour a different choice. The project specification and installed comparison should decide.
A Practical Specification Checklist
- Name the application, operating conditions and required flow.
- Identify the tube family, size, connection system and wetted materials.
- Attach the current product data and applicable certificate schedule.
- Check the route, bend limits, support, protection, insulation and joint access.
- Complete hydraulic calculations and, for underfloor heating, the thermal design.
- Record installation, testing and commissioning requirements from the selected system instructions.
The specifier resources and technical evidence index bring the supporting documents together. For a project discussion, send the technical team a route sketch, design duty and proposed connection details. Published Circle Square and Vulcan accounts show applications; they do not establish universal savings or comparative performance.
FAQs
No single material decides the best system for every project. Flexible 316L stainless steel is a useful option where the brief values a stainless tube water-contact surface and long, continuous routes. Compare the selected system's approvals, installation requirements, hydraulic duty and installed cost with suitable alternatives.
Choose the correct product family, size and connection system for the service. Potable-water distribution, heat-pump flow and return, underfloor circuits and final flexible connections have different design and evidence requirements.
Push-fit is a connection method. A specification should name the pipe material and the compatible fitting system, including required inserts or seals, rather than comparing a joining method with a material.
Do not assume hydraulic equivalence from the size label. Compare actual bore and product-specific pressure loss at the required flow, with the complete route and fittings included.
Use the current certificates and manufacturer datasheets linked below, then check the selected assembly. The technical-expertise page also links professional CPD credentials and published project accounts, with their different scopes explained.