Know way is that infrared, Trading Standards Should take this up or the advertising standards. They are clay burning elements.
Have just been looking for a deal as existing gas bottle ran out but interesting reading in the links posted above. Without factoring in the standing charge as I'd have to pay that anyway, this is still more expensive than gas and electric heating. Gas supply is 4p/kWh Electric supply is 15p/kWh Butane refill at £33 is 20p/kWh If the gas central heating is 50% efficient that would still only be 8p/kWh.
I would disagree based on the topic of this post - for 6kg bottled gas it works out about 35p/kWh, electric is about 15p/kWh. I could buy 2 possibly 3 oil filled radiators for £68, they tend to last as long as you have electric. Gas heaters need replacement canisters and usually at the most inconvenient time! Gas mains can work out much cheaper though @ around 7p/kWh, even with gas "boilers" being 90% efficient it's still is a cheaper option. Personally I'd rather have oil fired central heating - especially with the rise on gas prices and here in NI you are tied to only one gas provider - at least with the oil you can shop around and get emergency fill ups at the local petrol station! Electricity is still needed for both options though (gotta have a pump!), I have a 3kW UPS for that :D
I stated on the basis of my experience both having lived in home with gas central heating and one with only electric storage heaters. Electricity is relatively much more expensive than gas i.e. if you try and run electric heaters non-stop (like we do with gas-central) the bill will be stupendously higher.
Do you have stats to back that up? I'll give heat for the deal, personally I'd rather not risk it (yes I know my grandparents used them without issue), however I'd rather use oil filled radiators & fan heaters when my boiler goes offline. I can also control those via Alexa...