OSO HOTWATER | Products | OSO 20 Series: Sizing Chart

OSO 20 SERIES

Sizing Chart

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OSO 20 Series water heaters

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Sizing chart for the OSO 20 Series range of water heaters

Application

Indirect

Direct

Bedsit

R1 100

RD 100

1 Bedroom, 1 bathroom and shower

R1 125

RD 125 or RD 170

2 Bedroom 1 Bathroom and shower

R1 125 or R1 170

RD 170 or RD 210

3 Bedroom 1 Bathroom and shower

R1 170 or R1 210

RD 210 or RD 250

4 Bedroom 1 Bathroom and shower

R1 170 or R1 210

RD 210 or RD 250

2/3 Bedroom 2 Bathroom and shower

R1 170 or R1 210

RD 210 or RD 250

3/4 Bedroom 2 Bathroom and shower

R1 210 or R1 250

RD 250 or RD 330

4/6 Bedroom 3 Bathroom and shower

R1 250 or R1 330

RD 330

The installation of any unvented hot water storage system must comply with the current building regulations and approved document G3. The system must also be installed in accordance with the water regulations giving due care and attention to the design requirements of BS6700:2006 and BS EN 806-1:2000. Consideration should also be given to whether a direct cylinder is connected to an off-peak tariff, if so, the larger of the two capacities should be considered.