Aries 2000 Installation Manual v1.0
11
Water Pressure Requirement
As the bath requires a Thermostatic Mixing Valve, which has been manufactured to NHS
model engineering specification D08, and approved under the TMV scheme, please read the
following which outlines how a TMV may affect the use of your bath.
The working parameters of the TMV require a water pressure of 1-5 bar with a
maximum pressure loss ratio of no greater than 10:1 between hot and cold feeds.
The maximum bath water temperature according to DO8 is no higher than 43
°
C and
the maximum for the shower is 39
°
C.
It is important to note that a pressure difference between hot and cold pipes will have a great
effect on the time it takes to fill a bath, i.e;
Hot water 1.4 bar and Cold water 2.4 bar = Approx. 12.5min. to fill bath with 250 litres
Hot water 2.2 bar and Cold water 2.2 bar = Approx. 7min. to fill bath with 250 litres
If in doubt a pressure test should be carried out prior to installation of the bath, and if
required a booster pump or pressure reducing valve fitted, as required.