Is there much merit in fitting two thermostats to a large water
cylinder in a large property that is often occupied by just two
people who use the shower almost exclusively? I envisage mounting them
at one quarter and two thirds from the bottom of the tank and
switching between the two as required to the programmer.
Note the bottom one must be above bottom of the heating element
or coil, which is usually higher than you suggest. If it's too
low, it will sit on the area of the tank which always remains
cold, so the tank will heat as though there is no thermostat.
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My tank stat for my oil fired boiler, uses a probe which passes through
the 2" insulation right at the bottom of the tank by the drain valve.
It is set to about 35C.
The temperature in that area gets to about 40C according to a different
thermometer I have there.
There is very little benifit.
The convection currents in the tank cause similar masses of water to be
Use of a lower stat means water is slightly warmer than with and upper stat,
so no benifit.
This is why some tanks are fitted with twin immersion HEATERS which has the
effect you desire.
Even then, some heat moves downwards by conduction when the upper heater is
I have an instantaneous electric shower fitted in the same cubicle as a
This means I can use solar hot water or electic water when not available.
I suggest you get an electric shower if you never use the bath.
On Wed, 13 Aug 2014 07:37:12 +0100, harryagain wrote:
For once Harry is on the right track. Twin stats would only give
benefit if you have some means of only heating the top of the tank. A
conventional primary coil will reheat the whole tank.
If there is or can be fitted am immersion heater at the top of the
tank it might be cheaper to use that for small amounts of hot water
rather than the gas/oil heated primary. But TBH compared to space
heating water heating is minimal, another insulating jacket or boxing
in the tank and filling the void with insulation could concievably
make greater savings.
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