Heated oil pumped to boiler where it produces steam. Steam turns turbine to make electricity. Requires no furnace in winter. Heat from people, appliances, lighting enough to heat home. South facing windows capture solar heat, no windows on north side retain heat.
Water is pumped to heat exchanger which transfers heat to hot water tank.
Hot water used in home or to heat swimming pool or spa. Electricity produced in the daytime, stored in batteries for use during the night or on cloudy days. Solar generated electricity used to split water into hydrogen and oxygen. Hydrogen can be burned or used in fuel cells. Waste product is water.