England and Wales: 1900-1929
marketed sale
Cavity wall, as built, no insulation (assumed)
Solid, no insulation (assumed)
Low energy lighting in 75% of fixed outlets
Pitched, 100 mm loft insulation
Boiler and radiators, wood logs
Electric immersion, off-peak
wood logs
Room heaters, dual fuel (mineral and wood)
Mostly double glazing
double glazing installed before 2002
TRVs and bypass
RHI application
Cavity wall, filled cavity
Solid, no insulation (assumed)
Low energy lighting in all fixed outlets
Pitched, 250 mm loft insulation
Ground source heat pump, underfloor, electric
From main system
electricity (not community)
Room heaters, wood logs
Mostly double glazing
double glazing, unknown install date
Time and temperature zone control