Introduction
4
Heat output (±10%)
4.3 kW (14,781 BTU/hr) - High
5 kW (17,000 BTU/hr) - High
2.4 kW (8,188 BTU/hr - Low
2.4 kW (8,200 BTU/hr) - Low
12 volt
24 volt
Current draw (±10%)
4.0 amps High
4.16 amps High 2.08 amps High
1.91 amps Low
1.91 amps Low 0.95 amps Low
Fuel consumption (±10%)
0.53 l/hr (0.13US gal/hr) High
0.62 l/hr (0.16US gal/hr) High
0.27 l/hr (0.07US gal/hr) Low
0.27 l/hr (0.08US gal/hr) Low
OperatingVoltageRange
MinimumVoltage
10.2V
10.2V
20.4V
MaximumVoltage
16V
16V
32.0V
Workingpressure
2.5 bar (36 psi)
2.5 bar (36 psi)
Ambient operating temperature
-40°C to +80°C (-40°F to 176°F)
-40°C to +80°C (-40°F to 176°F)
Overheat temperature shutdown (±5%)
105°C (221°F)
105°C (221°F)
Weight
2.7 kg. (5.94 lbs.)
2.9kg. (6.4lbs)
Controls available
On/Off switch or 7-day timer
On/Off switch or 7-day timer
(Multi-FunctionTimer)
(Multi-FunctionTimer)
Espar’sHydronicD4/D5Heater
Quality engineered to provide a dependablemeans of heat-
ing, the Espar Hydronic 4/5 is a diesel fired coolant heater
capable of between
Hydronic 4 - 2.4 kW to 4.3 kW/hr (8,200 to 14,781 BTU/hr).
Hydronic 5 - 2.4 kW to 5 kW/hr (8,200 to 17,100 BTU/hr).
This compact coolant heater offers an affordable heating
solution tomany applications.TheHydronic 4/5 is ideal for
pre-heating the engines of trucks, cars, off-road equipment,
small trucks and boats. It features automatic heat regulation
while being fuel and power efficient. Since the heater runs on
fuel and 12 or 24 volt power, it is able to perform this com-
pletely independently of the vehicle engine.The unit regu-
lates the coolant temperature between a low of 65°C (149°F)
and a high of 80°C (176°F) by automatically cycling the
heater between heat levels.
TheHydronic 4/5 can be operated from the vehicle cab by an
on/off switch, a pre-select timer or a combination of both.
A flame sensor, temperature regulating sensor and overheat
sensor are among the safety features whichmakes the
Hydronic D4/D5 a safe and dependable heating system.
Note:
The heater is equippedwith a high-voltage
cutout as well as a low-voltage cutout.
Specifications
Hydronic 4
Hydronic 5
Note:
For specifications of gasoline heaters, please
see original manual in heater packaging
