:: hey will be at different temperatures. :: Assuming the heater is on :-) and running at rated power :-) then :: the one with the least effective radiating area is liable to be :: hotter, as long as eg there are not also conduction paths to deal with. Yes, I used a poor comparison. The point I was, well pointing out, was=20 their statement that the heaters operating temperature was lower, Apart=20 from the obvious question 'lower than what?'. If we are to assume that it=20 has a heating capacity of 2kW, then you can't have a cool 2kW of heat,=20 unless they are referring to input power (I just realised that is what they= =20 mean). The manual refers to it being able to oscillate. Colin -- cdb, colin@btech-online.co.uk on 2/02/2011 =20 Web presence: www.btech-online.co.uk =20 =20 Hosted by: www.justhost.com.au =20 =20 =20 =20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .