Thermostatically Controlled Engine Immersion Heaters

Fleets Reduce Electrical Costs Using
Thermostatically Controlled
Engine Immersion Heaters
Reduce your electric bill!
Use the Phillips and Temro
thermostatically controlled block
heaters to regulate engine heater
operating hours. Save money in
all weather conditions … from
mild to extreme cold … from
Kentucky to Alaska … there is a
thermostat available for your fleet.
Here’s how it works
Fleet managers use engine coolant heaters to
prevent costly “no starts”. The heaters are
routinely plugged in when the ambient air reaches
a specified low temperature, typically around
32° F (0°C). The heaters installed on vehicles
parked in the bay continuously draw electrical
current until the driver unplugs prior to start up.
Energy costs are reduced by controlling electric
power consumption with the Phillips and Temro
thermostat system. The thermostat regulates the
coolant temperature by cycling the heater on and
off according to the temperature range settings.
This ensures a fleet owner or manager control over
electric costs whether the truck is parked in the bay
or away. (Turn to the backside of this sheet to view
the thermostats available at Phillips and Temro and
actual test results).
Reduces engine heater
cycle time
Saves money by reducing
electrical costs
Maintains desired
Ensures start up and
optimal operation
System stays on-board
truck (versus a timer
system limited to home
base use)
Cost savings can be
realized away from
home base
System is not dependent
on a preset timer
Accommodates trucks
entering and departing
bay 24/7
Senses coolant
temperature instead of
ambient air temperature
Accurate engine
temperature readings for
efficient heater operation
Takes advantage of hot
engine cool-down period
when heater does not
need to be powered on
Available for most
engine models
Saves electrical costs
for any fleet
The makers of
Thermostatically Controlled Engine Immersion Heaters
Test results illustrate potential cost savings
Tests conducted with the thermostat system in extremely
cold Minneapolis, and the less severe climates of Boston
and Kansas City, reveal the benefit of using a thermostat with a
750 Watt heater on a Cummins 3.9L ISBe engine. It is evident
that the thermostat system greatly reduces heater operating
hours and electrical costs in each of the cold weather months.
Weather conditions, block heater wattage, and engine size
will determine the best thermostat model to use. A lower
temperature thermostat setting improves economy. A higher
temperature thermostat setting provides more engine heat.
Ordering Information
120V Y-Cords
3600064 Series
3600065 Series
3600079 Series
1/2” NPT thermostat only, 100°F ON/120°F OFF
1/2” NPT thermostat only, 55°F ON/75°F OFF
3/4" NPT thermostat only, 40°F ON/55°F OFF
1/2” NPT thermostat only, 40°F ON/55°F OFF
M22 x 1.5 thermostat only, 40°F ON/55°F OFF
Y-Cord with Weatherproof plug, 120V,
2-6’ lengths, 16 gage
Y-Cord with Standard plug, 120V, 2-6’ lengths,
16 gage
Indicator Light Weatherproof Y-Cord, 120V
2-6’ lengths, 16 gage
Annual Estimated Savings Using a
Thermostatically Controlled 750 Watt Block Heater
ESTIMATE: $0.10 per kWh electricity cost.
NOTE: Savings will vary depending on engine size.
Charts are based on 2004 temperature data.
Indicator Light — Weatherproof Y-Cordset with Thermostat
Phillips and Temro Industries
Eden Prairie, Minnesota USA • 800.328.6108 • Fax: 952.941.2285
Winnipeg, Manitoba, CAN • 800.665.0169 • Fax: 204.667.2041
Manufactured by Phillips and Temro Industries.
A world leader in engine pre-heating technology. For more information call the Sales and Marketing Department.
All specifications are subject to change.
Manufactured and Printed in U.S.A.
©2007 Phillips & Temro Industries 4/07