Give me a chance. I still have to go back to work again tonight:-).
I'll find the bits from the emails I have seen from a similar company (one that does not seem to be doing a right lot of sales ATM for some unknown reason)
It was complete bollocks wording such as "one of their £600 0.5kW heaters running 24/7 with their £200 thermostat is more economical than a cheap 2kW heater with a built in thermostat"