AW Generator - Plumbing Instructions


All plumbing shall be installed by a licensed plumber and conform with local & national codes.

Materials Needed:

  • 3/8NPT, 1/2NPT and 3/4NPT unions: recommended to allow easy disconnect of steam generator for servicing
  • 3/8" copper pipe and 3/8” male NPT adapter for the water supply to the generator.
  • 3/8" water supply shut-off valve.
  • 3/8" supply valve housing and filter (optional depending on local water conditions).
  • 1/2" copper pipe and (2) 1/2" male NPT adapters for the steam line between the generator and the steam room outlet.
  • 3/4" copper pipe and 3/4" male NPT adapter for the tank drain.
  • 3/4" copper pipe, fittings, and a union for the Pressure Relief Safety Valve drain.
  • Tube 100% silicone caulk.
  • Pipe compound suitable for drinking water use at more than 100°C.


Connect a cold water line to the generators water valve. The valve input is 3/8” NPT. A shut-off valve should be placed in the line for each generator to allow easier servicing later, if needed, and for emergency shut-off. Make sure the shut-off is open, providing water to the generator before first turning on.


  • Water pressure required: 20-100 psi (138-690 kPa)
  • If the generator is mounted in a place difficult for the home owner to access, the water supply shut-off valve should be located where it can be quickly accessed in an emergency.
  • Do not use a saddle valve or saddle fitting for the water shut-off valve.
  • Flush water supply line before final hookup.


  1. At the generator: Install a 1/2" male NPT sweat adapter directly into the tank. Install a 1/2" union in the steam line to allow easy disconnection for later servicing. Note: There must be no valves, shut offs or restrictions in the steam line!
  2. Run the 1/2" copper steam line from the generator to the steam room. Refer to SECTION 2: MOUNTING THE STEAM GENERATOR and Diagrams 3a and 3b.
    • The steam line must slope to allow condensation to drain into the tank or room.
    • There must be no dips in the steam line. Low areas may collect condensation and cause faulty operation or cause hot water to spit into the room.
  3. The steam line should enter the steam room 460 mm above the floor or at least 305 mm above a tub rim or ledge. The steam line outlet should be at least 150 mm from other steam heads to either side and 305 mm from walls or other surfaces to either side. See Diagrams 4, 5 and 6.
  4. At the steam room: Drill/prepare a 35 mm hole for the steam line entry. Center the 1/2" copper steam pipe in the hole. See Diagram 4.
    • Terminate the steam line with a 1/2" NPT male adapter.
    • Stub the line out into the room 9,5 mm from the finished surface.
    • Secure the steam line to a structural member.


Fill in gap (using 100% Silicone caulk between steam pipe and finished wall surface at point of entry (see Diagram 4). Apply silicone caulk to the finished wall side of the steam head insulator (see Diagram 5) and screw on hand tight until it is flush with the wall with the opening pointing down. If a hand tight fit does not align with the opening pointing down, use Teflon tape on the steam line threads to adjust the fit.


Slide the steam head on until it rests firmly against the finished wall. Tighten the hex head screw underneath the steam head to secure it in place with the Allen wrench provided. The steam head should be level with its fragrance reservoir at the top. See Diagrams 4 and 6.

IMPORTANT All fixture holes must be sealed with 100% silicon caulk to avoid moisture damage within walls. Check all of the standard fixtures in the steam room.


Install the pressure relief valve into its port on the generator. Install the safety valve within 150 mm of the generator. Run a 3/4" copper line from the valve to a gravity flow drain. The pressure relief valve outlet must drain in accordance with local and national codes.

AUTODRAIN All generators must have a drain valve installed to allow draining the tank for cleaning and maintenance. A manual ball valve is supplied. An electronic ball valve is available in the ADT-X Autodrain option. When installed, Autodrain automatically rinses and empties the steam tank approximately 1 hour after a steam bath stops. This cleans the tank to reduce problems caused by poor water quality and ensures every steam bath starts with clean, fresh water. Contact Helo Technical Support for more information. or 01342 300555.


Install 3/4" NPT pipe nipple directly into the tank as shown in Diagram 7. Install a 3/4" ball valve or an Autodrain on the nipple then add another nipple to the outlet of the valve. Add a union to the outlet nipple to allow easy disconnection during servicing. Run a 3/4" copper line from the union to a gravity flow drain via a tundish. The drain must be connected in accordance with plumbing regulations.


All drain lines must run downhill, away from the steam generator! Also see Diagram 3.

  • Do not run the drain uphill.
  • Do not drain the safety valve into the steam line!
  • Do not drain the safety valve into the steam room! Draining the tank into the steam room may present a scald hazard or damage the materials used to construct the steam room.
  • Do not drain into the steam room!