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The donkey CRX · 02-27-2015, 01:05 PM

Hi lilwilly, The preheater system is not on a timer. All 4 heaters (circulating water heater with pump, block water heater element, oil pan pad heater, and transmission pad heater are all turned on 2 hours before I leave for the shop in the morning. This is the amount of time it takes for the oil and water to reach between 160 - 180 degrees.

My winter electric bill has gone up about $6 to $11 per month from last year, but I also think we have had more below freezing days this year than last.

I put the 92 VX back on the road with the preheat and alternator delete at the same time, so I don't have any clean data on the improvement for the preheater alone, but I estimate it is worth an improvement of 3 to 4 MPG for my 54 mile commute.

Also, I plug the preheater up 2 hours before leaving the shop in the afternoon before heading back home.

Hope this answers your questions.

02-27-2015, 01:05 PM	#340 (permalink)
The donkey CRX Master EcoModder Join Date: Feb 2013 Location: TN Posts: 300 MULE VX - '92 Honda civic VX Team Honda 90 day: 92.6 mpg (US) White 94 VX "Show Car" - '94 Honda Civic VX VX 90 day: 79.92 mpg (US) The Walrus - '02 Honda Insight base Gen-1 Insights 90 day: 100.88 mpg (US) Thanks: 399 Thanked 564 Times in 189 Posts	Rely to lilwilly Hi lilwilly, The preheater system is not on a timer. All 4 heaters (circulating water heater with pump, block water heater element, oil pan pad heater, and transmission pad heater are all turned on 2 hours before I leave for the shop in the morning. This is the amount of time it takes for the oil and water to reach between 160 - 180 degrees. My winter electric bill has gone up about $6 to $11 per month from last year, but I also think we have had more below freezing days this year than last. I put the 92 VX back on the road with the preheat and alternator delete at the same time, so I don't have any clean data on the improvement for the preheater alone, but I estimate it is worth an improvement of 3 to 4 MPG for my 54 mile commute. Also, I plug the preheater up 2 hours before leaving the shop in the afternoon before heading back home. Hope this answers your questions.