Thermo Syphon Hot Water Runs With No Pump

way back in the late 60ties,I fitted in my own home, a reciculating pipe circuit.

Firstly with a Hot water cylinder on the first floor, a pipe,preferably copper is taken from the top outlet of the tank(non pressurized) to the furthest point in the house that you require an outlet to ie a bathroom or a kitchen on the floor below.do not consider the take off pipes at this time, call the very end of the pipe height "B"

the nexr point is important, the return pipe to the hot water cylinder is joined onto the end of the first pipe at the full distance away from the HWC, making an easy 180 degree turn,(bent pipes are prefered to sharp bend fittings) this pipe goes back to the HWC. To make this loop work well the end of the return to the HWC should be made with an essix coupling(HWC penetration) at the lowest height that the HWC normally stores hot water, ie not to the very bottom of the HWC, call this position"C".

the height of the turn around joints at "B" should be equally in height between Position "A" and position "B" This arrangement will allow hot water at the top of the HWC at position "A" to flow away from the HWC slightly dropping all the way to position "B", the water then flows back to the HWC,cooling all the time to position "C"

The water that returns back to the HWC pos "C", is not cold,but has less temperature than at pos A, so sets up the syphon "A" to "B" to "C"

for the water to return to the HWC at pos "C" there will be water entering at pos "A"

this is a syphon, water that is to be taken to bathrooms etc will be by making a "TEE" into the pipe that goes From "A" to "B". Many TEES can e fitted with no problem.

When Hot water is taken at these bathrooms etc, the Thermo syphon is interupted, but quickly restarts, think of the shortness of taking a shower, that that where there is no demand, watching tele or sleeping, there is always hot water PROVIDING you have Hot Water in the Cylinder. Best of luck.I insulate these pipe to save loss of hot water,it will still work, especially when you are not watching it Wild Blue