Thermann C7 26L C/Flow Hot Water Unit NG 50deg
  • 12


    Heat Exchanger Warranty



The Thermann C7 high efficiency Gas Continuous Flow unit ensures you will have enough hot water, when you need it. This unit has been developed to reduce wasted energy by pre-heating the water using heat from the gas exhaust, meaning you'll use less energy. With a 12 year warranty, you can rest assured you are covered for the life of the unit, and optional universal controllers ensure you always have precise control of your hot water temperature settings. The unit is available as a 26L model in both NG and LPG to suit your gas type.

  • 15% more efficient (26NG50C compared to 26NG50)
  • Japanese technology and manufacture
  • AGA approved
  • Over 50 years of manufacturing experience
  • Product quality guarantee
  • Watermark approved
  • Available in NG and LPG in 50 and 60 degree models
  • Optional universal controllers available

Prices are inclusive of GST

The Process

  1. A hot water tap is turned on
  2. Water enters the heater
  3. The water flow sensor detects the water flow
  4. The computer automatically ignites the burner
  5. Water circulates through the heat exchanger
  6. The heat exchanger heats the water to the designated temperature
  7. When the tap is turned off, the unit shuts down
Working Diagram
No. Bathrooms 2-3
Energy Rating 50°C (stars) 7.3
Energy Rating 60°C (stars) 7.0
Capacity at 25°C rise (L/min) 26
Capacity at 40°C rise (L/min) 16.25
Gas Type Available NG, LPG

Nominal hourly gas consumption (MJ/h) 173
Test point pressure NG (kPa) 0.84
Test point pressure LPG (kPa) 1.27
Minimum water pressure (kPa) 115
Maximum water pressure (kPa) 1200
Minimum gas inlet pressure NG (kPa) 1.13
Minimum gas inlet pressure LPG (kPa) 2.75
Maximum gas inlet pressure NG (kPa) 5.0
Maximum gas inlet pressure LPG (kPa) 7.0
Minimum flow rate ignition (L/min) 2.7
Input voltage single phase 50HZ (v) 240

Maximum output current (A)

- incl anti-frost heater



Inlet gas connection male thread R3/4” (20mm)
Cold water connection male thread R3/4” (20mm)
Hot water connection male thread R3/4” (20mm)
Condensate connection male thread R1/2" (15mm)
Relief valve pressure setting (kPa) 1400
Weight dry (kg) 20.5
Dimensions (DxWxH mm) 205x366x573

IAPMO Approval Certificate no. GMK10409. Watermark Certificate of Compliance WMKA-000506

ThermannC7 Continuous Flow Line Drawing 1    Service manual dimensions
Optional AccessoriesCode
Universal Controller with 15m cable 9505082
ResizedImage600450 universal controller

Where to Buy

Thermann hot water systems are available exclusively through Reece Plumbing. Find your nearest branch by entering your postcode below.

(You will be taken to the Reece website)


Here are the most common questions we get asked about hot water.

Get in Touch

Want to find out more about any of the hot water systems in the Thermann range? We’re happy to help.