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Welcome to Mission Technologies Sharing Because We Care

The MT website authors recommend this humorous and interesting book about a westerner moving to, and living in, Singapore:

Click on the icon to go to Kobo Books, where you can purchase and download an eBook copy today!

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Hot Water Cost Calculator
This calculator will give the cost of heating a complete tank of water from cold.

A small change in efficiency has a significant change in cost as does the temperature required.

This means that knocking the efficiency up with a Hot water jacket and if possible preheating the cold water input via a heat exchange or solar heating is going to reduce to electricity bill significantly.

Size of Hot Water Tank in litres
Change in water temperature (tempout-tempin) in degrees C
Efficencey of Hot Water Tank
Price of kWh unit
Total kWh's
Total cost
Header Tank Pressure Calculator
This calculator will give the Hydrostatic pressure at the bottom of the Heater Tank.

This is useful to know if you are using a on-demand hot water system, most of which require 0.2 bar to function.

The formula is P = pgh where;

P = pressure
p = is the density of the fluid (i.e. the practical density of fresh water is 1000 kg/m3)
g = the acceleration due to gravity (approx. 9.8 m/s2 on Earth's surface)
h = the height of the fluid column in meters.

p = is the density of the fluid
(i.e. the practical density of fresh water is 1000 kg/m3)
g = the acceleration due to gravity
(approx. 9.8 m/s2 on Earth's surface)
h = the height of the fluid column in meters
Total pressure in Pa
Total pressure in bar


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