"Mark" wrote in message
...


Well said. 1 watt = 3.414 BTU of heat (at least since the 1870s when it
was
defined). No exceptions so far.



Actually 1 Watt = 3.414 BTU ___per Hour___

So if you run a 1 Watt heater for one hour it will consume 1 Watt
hour of energy and deliver 3.414 BTU of heat.

Or in more useful number

if you run a 1 kW heater for 1 hour it will consume 1 kW Hour of
energy and cost about $0.15 and deliver 3414 BTU of heat.

Mark


Yes, good point. Since Energy= Power x Time and the BTU is an energy
unit, time has to be included someplace.

It could also be written as 1 watt of power used for 1 hour or 1 watt-hour =
3.414 BTU

Tomsic