I worked in R+D for BAXI in Alternative energy's and brought / designed the Air Source heat pump to the UK market and had a hand on the European models, I designed the solar systems (DHW an Photo Volt) and controllers for Baxi for European markets, I all so had a hand in the combined Heat and Power and ground source heat pumps for the domestic market on the controls side. I may have an unholy knowledge of most other types of domestic heating plant pros cons and efficiency's, I have given public takes on solar and heat pumps at Lancaster Uni
I run my car on WVO and do not understand why everyone dose not do this,
I and several Friends have land in Portugal that is completely off gird for power, water etc... we will only be connected to sell back power! waste water treatment is via reed beds, solar hot water, compost loos etc... everything is a sustainable as possible....