Thermann  135L 4* Gas Hot Water System
  • 7


    Cylinder Warranty



The Thermann 4 star Gas hot water system is suited to families of 3-5 people. With an adjustable thermostat for safety and efficiency, it allows you to be in control of your operating costs and performance.

  • 4 star efficiency
  • Full mains pressure taps
  • Small footprint - easy replacement

Prices are inclusive of GST

Must be installed by a licensed plumber.

Cold water enters the storage tank at the bottom, where a gas burner heats the water. Exhaust fumes are released using a flue. As the water heats, it rises to the top of the tank. When hot water is required, the outlet valve at the top of the tank where the water is at its hottest is opened.

ResizedImage400431 gas hot water diagram
Capacity (litres) 135 170
Net Weight Empty (kg) 72 86
Relief Valve Pressure (kPa) 1400 1400
Gas Consumption (MJ/hr) 135NG: 29.5

135LPG: 28
170NG: 33.5
Recovery Rate at 45°C rise (L/hr) 130 146
First Hour Delivery 265 316


Dimensions (mm)135L170L
Height (A) 1600 1900
Hot Water Outlet (B) 1325 1620
Cold Water Inlet (C) 220 220
Gas Inlet (D) 300 300
Water Inlet/Outlet Left Left

*Specifications correct for gas storage models manufactured after 1 August 2016.

Selecting the right unit for you

No. People 3-4 4-5
 Thermann 4 Star Gas Storage Line Drawing 1 Thermann 4 Star Gas Storage Line Drawing 2

When choosing a hot water system, there are a number of factors you need to consider beyond the unit price. Installation costs can vary greatly for different types of hot water units. Ongoing running costs should also play a part in your purchase decision.

running cost chart

Guide only based on current average energy cost. This chart does not account for increased Electricity or Gas costs in coming years.

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.