Rheem 20L Gas Continuous Flow

The Rheem 20L Continuous Flow Gas Hot Water System offers reliable, on-demand hot water for medium-sized households. Designed for outdoor installation, this compact and energy-efficient unit delivers a steady 20 litres of hot water per minute—so you never run out mid-shower. Whether you’re upgrading your existing system or building new, this is a smart, space-saving solution with modern safety features and great performance. Available in both natural gas and propane options, and with temperature-limited 50°C models for family safety, Rheem has your hot water covered.

FEATURES:

Heating Method: Gas burner with electronic ignition

Hot Water Supply: Endless supply – heats as you need it

Recovery Time: Instantaneous

Installation Location: Outdoor only

Water Pressure:

Minimum: 120 kPa

Maximum: 1000 kPa

Energy Efficiency: 6-Star rating for energy savings

Operating Costs: Lower than traditional systems due to on-demand heating and no standby losses

Best for: Medium homes with moderate to high hot water needs

Additional Features:

  • Compact Design: Wall-mounted to save space
  • Optional Remote Controls: Control your hot water temperature from kitchen or bathroom
  • Safety Features:
    • LED display for diagnostics
    • FlameSafe® automatic shutdown
    • Overheat protection
  • Accessories Available:
    • Pipe cover, recess box, security cage, and wall mount kits
  • Family-Friendly: 50°C preset models avoid scalding without needing extra valves

Specifications

Hot Water Delivery: 20L/min (at 25°C rise)
Gas Consumption: 157 MJ/hr (natural gas or propane)
Weight (Empty) 16 kg
Height 585 mm
Width 355 mm
Depth 188 mm

Warranties

Manufacturers Tank Warranty (Domestic) 12 years on the heat exchanger
Manufacturers Parts & Labour Warranty (Domestic) 3 years

Technical Specifications

Powerpoint Required: Yes – standard weatherproof outlet
Hot Water Connection: R 3/4 BSP
Frost Protection: Built-in
Preset Outlet Temperature: 50°C model (Model 876A20 – no tempering valve needed)
60°C model (Model 874A20 – adjustable)
Electricity Consumption: 43.9W (burner on, anti-frost inactive)
116W (burner on, anti-frost active)