Relay for heater
I've got a 24 volt Eberspacher D10W hydronic heater with a 7 day timer. There's 5 fans blowing across 5 radiators that are all powered by one breaker switch. I was hoping to wire in a relay so with the breaker one the hydronic would have control over the fans coming on without me having to go down to the boat to throw the switch. I assume a 24 volt continuous duty with a amperage rating equal or greater than the breaker would work? Anyone know which wire gets power coming from the heater? I've heard once the water hits 100 the computer puts 24v to one of the pins just not sure which?