MBH927
Jul 17, 2010, 10:20 AM
Selecting Replacemet Heaters - Voltage Rating choices.
KISS
Jul 17, 2010, 10:43 AM
It might.
It's pick the 208/240 because likely the mfr chose the midpoint as the resistance of the heaters to size them at. (240-208).
The wattage has to be slightly different for each voltage: 208, 240, 277. Assuming R is constant at a given temperature. P(watts) = V^2/R where R is resistance in ohms.
tkrussell
Jul 18, 2010, 06:49 AM
Yes it matters, 240-208 volt rated units used on a 240 volt service will operate at full power.
277-240 volt units used on 240 volts will not.