This doesn't take in the fact of losses through transfer from water storage
tanks and the variable temperature of the hot and cold water storage tanks
refilling from their respective supply when water is drawn from them. This
can never be taken as constant.
A shower outlet will only allow a certain amount flow rate no matter at what
supply pressure (all the little holes in the head can only take so much) so
the shower should be set to allow optimum flow from the actual outlet. This
reduces the effect of it actually choking itself with excessive push back
forces (the equal and opposite forces thing).
The temperature of the hot supply should be set 12 to 15 degrees C above
normal body temperature (37degrees C or 98.6 F) to allow for blending and to
give a variable control for differing personal needs and wants, but never
being allowed to get to the point of being able to scald the skin. As we
age, we lose the ability to regulate temperature properly, so it is safer to
have the maximum temperature of the supply set to a safe and with standable
level. This applies to children as well.
The pump used should be fixed to allow an output of only a third of the
volume of the water that is supplied to feed it. This reduces the
possibility of the pump ever running dry by emptying the supply tanks. The
tanks should also be set to allow an output of only a third of the volume of
the its supply. Pumps should always be supplied from tanks which allow the
water to settle and become still before being drawn off to the pump. The
stops the effects of aerated water being drawn into the pump and causing
spluttering of the water at the outlet due to the build up of trapped air
within the impeller. This also reduces the build up of scale within the
pump and mixing valve by keeping a constant flow of water and not a mixture
of air and water.
Yes, you're right, it is amazing what you think of while standing in the
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