Abstract: A solar power system has a photovoltaic module that supplies electrical current derived from sunlight to a heater system of a hot water tank. The heater system uses the electrical energy from the photovoltaic module, and optionally also from a local power grid, to heat water up to a selected maximum stored hot water temperature. Control circuitry senses when the level of electrical power is below a threshold solar-power level, and in response sets the stored hot water temperature for the heater system to a first lower temperature value. The control circuitry also senses when the level of electrical power is above the threshold solar-power level, an in response sets the stored hot water temperature for the heater system to a second elevated temperature value higher than the lower temperature, making advantageous use of solar power when available. A mixing unit adds cold water to set the dispensed water temperature.

Abstract: An insulation system for a water heater storage tank containing water heated to a temperature higher than ambient is provided. The water heater tank has a substantially cylindrical shape and a generally circular top portion from which one or more pipes extend. A top insulation structure having two half-moon shaped insulation segments lies on the top portion insulating most of it against heat loss to the ambient environment. The insulation segments each comprise an envelope of pliable heat-resistant sheet material enclosing shapeable insulating filler material of particles. The envelopes are deformable to conformingly fit between and around pipes projecting up from the top of the water heater. An insulating jacket extends around and covers a substantial portion of a radially outwardly disposed surface of the water heater tank.

Abstract: An insulation system for a water heater storage tank containing water heated to a temperature higher than ambient is provided. The water heater tank has a substantially cylindrical shape and a generally circular top portion from which one or more pipes extend. A top insulation structure having two half-moon shaped insulation segments lies on the top portion insulating most of it against heat loss to the ambient environment. The insulation segments each comprise an envelope of pliable heat-resistant sheet material enclosing shapeable insulating filler material of particles. The envelopes are deformable to conformingly fit between and around pipes projecting up from the top of the water heater. An insulating jacket extends around and covers a substantial portion of a radially outwardly disposed surface of the water heater tank.

Abstract: A solar power system has a photovoltaic module that supplies electrical current derived from sunlight to a heater system of a hot water tank. The heater system uses the electrical energy from the photovoltaic module, and optionally also from a local power grid, to heat water up to a selected maximum stored hot water temperature. Control circuitry senses when the level of electrical power is below a threshold solar-power level, and in response sets the stored hot water temperature for the heater system to a first lower temperature value. The control circuitry also senses when the level of electrical power is above the threshold solar-power level, an in response sets the stored hot water temperature for the heater system to a second elevated temperature value higher than the lower temperature, making advantageous use of solar power when available. A mixing unit adds cold water to set the dispensed water temperature.