Active Systems and New Technologies 

Modern Condensing Boilers
Are around 95% efficient, as opposed to previous typical 65-75% efficiency. Heating controls such as Programmable thermostats and time and temperature zone control make a big difference too.

Solar Thermal Panels (for water heating)
Either Flat Plate or Evacuated Tube collectors on a south-east to south-west facing roof can heat around 60 % of domestic water annually, and do work even on cloudy days.

Solar Electric Panels (Photo Voltaic “PVs”)
Generate electricity, which can be sold to the national grid or used yourself.

BioMass Boilers
Such as woodchip or wood pellet boilers burn wood waste in automated or semi automated silo and boiler arrangements, where you only take deliveries months apart, and the day to day operation is almost automatic. Log boilers do not require an automated supply and in conjunction with a suitably sized accummulator tank, can store the heat from a single firing for use throughout the day

Heat pumps
Work off electricity, like a refrigerator but in reverse- they cool something down and produce heat. The ‘something’ cooled might be the ground around you, the air, the water in a river. The efficiency ranges from 250-400% for ground source (1 kilowatt of electricity yields 2.5-4 kilowatts of heat output) and around 200% for air source. N.B. These are not strictly speaking alternative technologies- the electricity in the power grid is mostly gas or nuclear powered- but they do save energy and attract increasingly generous subsidy from the Government.

Rain Water Harvesting
Such systems are a bit lower down the scale of energy saving, but can save rainwater for your own use and offset mains water charges.