OmniSoak
Your soak, worked out to the litre. Search your Omnitub size and OmniSoak shows you exactly what it takes — water for any number of bathers, at any weight, depth and temperature, with the precise hot-and-cold split. Total transparency before you ever run a tap.
What OmniSoak works out for you
OmniSoak is Omnitub’s free bath water calculator. Choose your Omnitub size and OmniSoak shows you exactly how much water it takes to fill — for any number of bathers, at any weight, depth and temperature — along with the precise split of hot and cold water you’ll need. It’s complete transparency on water use and heating before you ever run a tap, across our deep soaking and Sheer ranges, with seated tubs to follow.
Common questions about bath water & temperature
How much water does a bath use?
A standard acrylic bath holds roughly 150–200 litres. An Omnitub deep soaking bath is built for a fuller, deeper soak and holds from about 260 litres (our smallest) to over 1,000 litres (our largest) when filled to the 525 mm soak line. With a bather in the tub the body displaces water, so the amount you actually run is lower — OmniSoak shows the exact figure for your size, depth and number of bathers.
How much hot and cold water to fill a bath to 40°C?
To reach a 40°C bath by mixing hot water delivered at 60°C with cold mains at 10°C, you need roughly 60% hot and 40% cold. For a 288-litre soak that’s about 173 litres hot and 115 litres cold. OmniSoak calculates the precise hot-and-cold split for your tub, your target temperature and your incoming water temperatures.
How much water does a deep soaking tub hold?
Omnitub deep soaking tubs hold between roughly 260 and 1,000+ litres to the 525 mm soak line, depending on size. OmniSoak lists the capacity of every size — the empty volume and the volume in use with one or more bathers.
Does bather weight change how much water a bath needs?
Yes. A submerged body displaces roughly its own weight in litres of water, so a heavier bather — or more bathers — means you run less water to reach the same level. OmniSoak lets you set each bather’s weight individually, in kg, lb or stone, and adds them up.
How deep is an Omnitub soak?
Every Omnitub deep soaking bath has a 600 mm internal depth with a 525 mm soak line, far deeper than a standard bath. OmniSoak lets you plan any fill depth from 350 mm up to the 600 mm brim and shows the water and heat needed for each.