The OASIS SCH33 is a compact space heating system with optional on-demand potable hot water. The OASIS SCH33 is easy to install and has its own internal circulation pump. It requires less than 2 square feet of space, and is only 7.5 inches high. It is the perfect choice for smaller C-Class and Sprinter chassis RVs.

The OASIS SCH33’s diesel boiler provides 33,000 True Output BTU, supplemented by 5,000 BTU of auxiliary heat from a 1500 watt electric element (available in 120 or 240 VAC) which can provide limited hot water (optional) and space heating without diesel burner use while plugged in. The OASIS SCH33 has the ability to heat four separate thermostatically controlled space heating zones. The OASIS SCH33 has the option of using an external high efficiency flat plate heat exchanger with an easily adjustable potable water temperature control. If this option is installed, the OASIS SCH33 is able to provide continuous, on-demand potable 120°F hot water at a flow rate of 1.0 GPM. The OASIS SCH33 also has the option of using an external high efficiency flat plate heat exchanger to extract engine waste heat to improve efficiency within the heating system, and to pre-heat the engine with the addition of an optional pre-heat pump.

The OASIS SCH33 is compatible with the ITRTouch™ remote control interface, an easy to use, state-of-the-art means of controlling, operating and diagnosing the system.

The OASIS SCH33 uses ITR’s patented “no-smell, no-smoke” burner platform. This proven technology is quiet, and clean-burning, and improves safety and efficiency, while also lengthening system maintenance cycles. The OASIS SCH33 is CSA/UL certified.

Diesel Burner TRUE OUTPUT
33,000 BTU/hr 9.7KW
Auxiliary Electrical Heat
One 1500 Watt Element, 5,000 BTU Output
Burner Design
Proprietary ITR Low Pressure System
Maximum Water Temperature and Flow Rate
120°F @ 1.0 GPM (if installed externally)
Temperature Rise (ΔT) of Incoming Potable Water
60°F (if installed externally)
Coolant Tank Capacity
1.2 US gal / 4.55L
Fuel Consumption (continuous running)
0.28 US gal/hr / 1.06 L/hr
Engine Preheat System
Available Option (installed externally)
Amperage Draw (running)
6.5 amps
Amperage Draw (circulation pump)
2.5 amps
Amperage Draw (optional engine pre-heat pump)
2.5 amps (if installed)
Available Heating Zones
Heating Circulation Loops
WiFi Touchscreen Remote Interface
7.5"H x 11.0"W x 18.8"D
Weight (empty/full)
47 lbs / 57 lbs