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


Mark