running two heaters in series

(davidgree1) · (davidgree1) **Join Date: Apr 2002** 02-06-2009, 11:29 AM

Has anyone run two Heatercraft 3 outlet heaters in series? Any problems??

(rallyart) · (rallyart) **Join Date: Nov 2006** 02-06-2009, 12:06 PM

I do on my Mercruiser Black Scorpion. Both are about the same height as the heads on the engine. With both fans blowing high and air coming out the second is just as good as the air coming out the first. My minimum engine RPM does not seem to be any higher either, to get heat. So, no issues what so ever.
Mine are on opposite sides of the boat so the plumbing is a bit more complex. Just remember to put some drains in the low spots on the lines so you don't have to pull the hoses every winter. Lots of Hot Tubes are great.

(riverside) · (riverside) **Join Date: Mar 2002** 02-09-2009, 11:35 PM

Got a lY6 wich are known for producing less heat to heaters due to the reverse cooling.
I,m installed 2 heater cores on top of eachother making the core twice as thick.
Not sure if it works but worth a try.

I surfed the forums a lot about heaters in series and IIRC there were no problems at all.