I've got an Edelbrock unit right now. Had it for years, but it's never really worked. It's wired up properly with the factory supplied relay, but the nominal voltage (says right on the heater element) is 13.7 VDC. My battery will show 13.1 VDC at rest and it flat doesn't work at all when the motor is off. In fact, even while it's running my magnum one wire alternator is only putting out 14 VDC at best. It's just not enough juice to power this thing and it barely gets warm at all.
This is the one I have now.
Fortunately we don't have to deal with cold temps here enough for it to really be a factor. Still, it would be nice to have a heater that works for the first and last month of the boating season. More than once I found myself cussing under my breath when it just woudn't hit due to low pressure/cold temps.
I'm hoping somebody out there makes a more efficient heater. Can anybody recommend one that works and only requires a true 12 VDC (or closer to it anyway)? I've checked ads and they'll tell you the power the heater puts out in watts, but don't say how much voltage it takes to run one.
I did find this one that shows various wattages vs. voltages. Nice looking unit, but I don't know if I can make it fit my bracket. If you buy it with the bracket/heater as a complete unit it's like $300 bones.
Thanks in advance.