For heating water in a household system solar energy would be captured and used to heat the water in the water cistern. The use of solar energy would be supplemented when necessary by conventional use of electricity or a by a fuel heated boiler system as shown in the sketch.
The diagram above is from the following blog post:
Note that there are 2 water circuits. The one pump pumps cold water (blue) through a solar panel arrangement inclined to gather the maximum amount of sun radiation while the other "standby system" circulates water through a boiler system. A boiler system can use various kinds of fuel such as electricity, oil, propane (LPG)or natural gas.
Another option would be to install a tankless water heater on a separate piping and faucet (tap)as a standby system to the solar energy arrangement.
Tankless water heaters are energy efficient since they only heat the water used and thus the system unlike a normal cistern arrangement does not lose heat by convection from the walls of the cistern.
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tankless, solar, power, lpg, propane, boiler, sun, heating, water
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