On 10 Dec 2005 05:48:11 -0800, wrote:

powerstation wrote:

A 3Kw oil filled heater, or a 3kw fan heater, or a 3kw radiant heater
will
all cost exactly the same amount to run.

If they are energised for the same length of time

But the oil heater will need to be on for longer to bring the room up
to a given temp, and will then give out that stored heat after switch
off. Oil filled heaters are also the largest and highest purchase cost
option.

My point exactly, the 3kw is the input rating, not the output.

Yup. Theyre also the bulkiest. I think their advantage is theyre safe
around kids, more so than fan heaters which can be blocked, or old
radiant heaters that can be poked. And theyre silent, but so are
convectors and (real) radiators.

I am gobsmacked. If you put 3kW into a heater, apart from a few microwatts
of electrical radiation, 3KW is what you get out..


NT