OSO Optima Triple Coil

The unique tank-in-tank construction provides optimal working conditions for heat pumps up to 12 kW. The large buffer tank (> 100 l.) is suitable for space heating such as under-floor heating or wall mounted radiators. The upper heating coil in the buffer tank pre-heats DHW before shifting it to the DHW tank in the top. In addition, the water in the buffer tank transfers heat to the domestic hot water tank. Both features reduces return temperature to solar collectors / heat pump and maximizes COP like no other solution on the market. There is no heat transfer from the DHW to the buffer tank due to carefully designed features. Should the heat pump fail, there is full electric back up through the 9 kW electric heater.

Once there is domestic hot water use, the variable valve in the heat pump switches its flow into the 1,8m² heating coil in the DHW tank, providing maximum heat transfer and domestic hot water production. During this time, the buffer vessel continues to provide consistent temperature to the space heating system, without compromising performance. In addition, the Optima Triple Coil allows for a third energy source such as a boiler if desired. The 3kW immersion heater heats the water up to 70°C. Separate ½” sensor pockets for precise control from the energy source is factory fitted. Low heat loss is provided by OSO ECO Foam, with impressive key figures for GWP of 1 (Global Warming Potential) and ODP of 1 (Ozone Depletion Potential.)

Key advantages:

The ultimate tank-in-tank unit for heat pumps up to 12kW and solar collectors up to 12m², providing both DHW & space heating

Unsurpassed energy efficiency with minimum heat loss and maximized COP

Impressive DHW production compared to traditional tank-in-tank units

10 year warranty on the stainless steel inner cylinder & OSO ECO Foam insulation