Word has reached us that Rinnai is now offering a 190L cylinder as part of the Rinnai mains pressure stainless steel thermosiphon / wetback range. According to the Rinnai team, this product is designed to replace the typical 180L low-pressure copper wetback cylinder.

The Rinnai 190L stainless steel wetback cylinder was released in September 2018, just a year after the release of the 250L and 300L cylinders. All of the tanks have a maximum working pressure of 850kPa and come with a 10-year warranty.

How does it work?

Like most wetback cylinders, Rinnai cylinders use the thermosiphon effect to circulate the mains pressure water through a coil inside the cylinder. This does away with the need for a pump, which means less energy cost and a stable supply of hot water – even in the event of a power outage.

These wetback cylinders provide a modern way of using wetback systems to heat our homes. Traditionally, a wetback must be connected to an open-vented low pressure water circuit to prevent explosion due to thermal expansion. On the other hand, Rinnai’s thermosiphon cylinder allows you to connect a mains pressure hot water cylinder to a wetback fire. The technology is not new but there’s more to this product.

Notable features

The impressive thing with Rinnai thermosiphon / wetback cylinders is the duplex stainless steel 2304 construction of the inner cylinder, which is manufactured locally in New Zealand. This material has a duplex microstructure and contains low nickel and high chromium concentrations, which give it impressive qualities that make it suitable for residential and commercial water heating applications. These qualities include:

• High thermal conductivity
• Low thermal expansion
• Corrosion resistance
• High resistance to stress corrosion
• High mechanical strength
• Good fatigue properties

Its high-grade duplex stainless steel is also suitable for high-temperature applications. So the cylinder can be used with solar systems which tend to produce extremely high incoming water temperatures.

Another feature worth noting is the eco inlet that makes connecting the cylinder with an open loop solar system or a hot water heat pump easy. Since they connect to the mains pressure, the cylinder is suitable for indoor installations.

Below are the product specifications of the Rinnai 190L stainless steel thermosiphon cylinder:

	Code	Litres	Diam.	Height	Element	Thermostat
Part Number	MS190550CT20	190L	550mm	1355mm	2kW	Automatic reset
	MS190550CT30	190L	550mm	1355mm	3kW	Automatic reset

 

If you want this type of wetback cylinder installed in your home, whether it’s a new build or a retrofit, contact us on 0800 692 672.