5000 watts is equal to about 15,000BTU.

I don't know if it matters, but that is 15K BTU when electricity is converted into hot water heat radiation. In other words, 5KW of electric will produce 15K BTUH of hot water, baseboard radiation.

The formula is
1KW= 3.413 BTU per hour or BTUH
So your 5KW heater is 5*3.413 or about 17000 BTUH

Thanks for the info.
I was wondering why I couldn't make it add up.
So now I have a conversion factor:
1 KW = 3.413 BTU per hour.

Thanks.

Pooh Bear

1KW should be 3,412 BTU per hour not 3.412. 1W = 3.412 BTUH.

Aemeeich is indeed correct.

Thanks for the correction.
For the purpose of comparing heaters
I'm gonna round it off to to 1KW=3500BTUH.

Thanks.

Pooh Bear