MIL-PRF-44466 Heater, Water And Ration \(Hwr\)This specification covers one type of heater for use by mounted troops that will heat rations, water for beverages and for limited personal hygiene \(see 6.1\).

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MIL-PRF-44466D

3.2 Operating requirements. The Heater, Water and Ration (HWR) shall satisfy the

following operating requirements.

3.2.1 Temperature selection settings. The HWR shall have a low temperature setting of 1550F

+ 50F and a high temperature setting of 1850F + 50F.

3.2.2 Heating water. The HWR shall be capable of heating water.

3.2.3 Heating rations. The HWR shall be capable of heating 40 ounces of water in the main

compartment and 5 Meal, Ready-to-Eat (MRE) entrees.

3.2.4 Capacity. The HWR shall have a minimum capacity of 1 gallon of water in the main

compartment. The removable inner container shall have a minimum capacity of 40 fluid ounces

and 5 MRE entrees.

3.2.5 Control panel. The control panel shall consist of a low, off, high temperature selection

switch, a power use indicator light (green), a heating element operation indicator light (white), an

electric supply receptacle, and a water spigot.

3.2.6 Safety. The HWR shall be safe to operate in accordance with the standards specified

herein.

3.2.6.1 Pressure relief. The HWR shall have the capability to relieve pressure buildup within

the heating unit.

3.2.6.2 Automatic shutdown. The HWR shall automatically shut off power when the water

level in the main compartment is empty or the internal temperature exceeds 2050F. Following

cooldown, the HWR shall be capable of heating water.

3.2.6.3 Spillage. Closure and securing of the HWR lid shall form a watertight seal to prevent

spillage.

3.3 Interface and interoperability requirements. The HWR shall satisfy the following

interface and interoperability requirements.

3.3.1 Operating current. The HWR shall operate on a 24/28 Volt DC system while drawing a

current not less than 10 amps and not greater than 15 amps at 28 volts.

3.3.2 Low voltage detector. The HWR shall have a low voltage detector which activates the

heater off latch if the voltage falls below 20 Volts DC.