Hotflo Gas Storage 135L

As a general guide, the right gas storage tank size depends on the number of people in your household and your hot water usage habits.

For example:

1–5 people → 135L gas storage tank
5+ people → 170L gas storage tank

Every household uses hot water differently, so it's worth considering factors such as how long your showers are, whether multiple showers are used around the same time, how often you run the washing machine or dishwasher, and whether you regularly have guests staying. If your household has higher-than-average hot water demand, choosing the larger tank can provide extra peace of mind.

A Continuous Flow (also known as tankless or instantaneous) hot water system heats water only as it’s needed, providing an endless supply of hot water without the need for a storage tank. These systems are compact, energy efficient, and ideal for homes with limited space or varying hot water demand. They are available in gas models and electric models.

A Storage Tank system heats and stores a fixed amount of water, ready for use throughout the day. It’s a reliable choice for households with consistent or high hot water demand, as it can deliver water to multiple outlets simultaneously. However, once the stored water is used, the tank needs time to reheat.

A Heat Pump system works differently – it extracts heat from the surrounding air to warm the water stored in the tank, much like a reverse-cycle air conditioner. This makes it one of the most energy efficient hot water options available, especially in mild to warm climates.

Owner/User checks – Six monthly service

• Operate the Pressure and Temperature Relief (PTR) valve for approximately 10 seconds by operating the easing lever on the valve to ensure water is relieved to waste through the relief drain pipe.

• Check to ensure the valve closes correctly.

Authorised personnel – Five year service

The five year service must be carried out by a licensed tradesperson. It is recommended that this service be carried out by your local Rinnai Service representative. The service should include the following:

• Replace the Pressure and Temperature Relief (PTR) valve.

• Replace the anodes (in areas of harsh or adverse water conditions, a more frequent check of the anodes is recommended).

• Flush the water heater by doing the following:
  – Turn off gas supply.

  – Turn off the cold water supply to the water heater at the isolating valve.

  – Gently operate the easing lever on the Pressure and Temperature Relief valve to release the pressure in the water heater.

  – Disconnect the cold water inlet union to the heater and attach a drain hose.

  – Gently operate the Pressure and Temperature Relief valve to let air into the heater and allow water to escape through the hose.

  – Flush the heater until clear water appears then reconnect all fittings, fill the heater and restore the gas supply.