TwinTemp Junior – 60,000 BTU Space and Water Heater for Cabins and Tiny Houses

TwinTemp Junior

Tankless water and hydronic space heating for cabins, tiny houses and park models.


Buy PrecisionTemp TwinTemp

Hydronic Heat — Now Without Diesel

Unlike diesel-only tankless water and hydronic heaters, the TwinTemp runs on propane and can be used in most residential applications like cabins and tiny houses.

In addition to the versatility of propane, the TwinTemp Junior offers greater heating efficiency, whisper-quiet operation, safer flue gas temperatures and no scheduled maintenance.

Dual-Source Unlimited Heat

With a 55,000 BTU propane burner—the highest hot water output in the industry—and a 1500-watt electric element, the TwinTemp Junior delivers on-demand, continuous hot water and hydronic space heating.

The heater operates only when the hot water outlet is turned on. The VariFlame control system then keeps the water temperature constant, regardless of the flow rate or incoming water temperature.

More Hot Water and Heat. Less Propane.

With higher efficiency and 60,000 BTUs, the TwinTemp Junior produces more hot water than traditional water heaters.

With higher efficiencies, many people report that they use up to 50% less propane. Homeowners love the lower operating costs and fewer fill-ups.

    • Never run out of hot water again!
    • Hydronic heat means no more cold spots
    • Whisper-quiet operation
    • No diesel smell
    • No scheduled maintenance
    • No pilot light and 35% higher efficiency
    • Reliable, proven VariFlame technology control system
    • Lighter, compact design that saves space and gas usage
TwinTemp Versus the Competition

Type: Gas instantaneous, power vent water / space heater.
Full gas modulation temperature control
Certified to UL 307A & ANSI Z21.10.3
Dimensions: 20.5″ Wide x 16″ Deep x 14″ High.
Weight: 75 pounds
Hook-ups: Gas, brass 3/8″ flare.
Water and heating lines 1/2″ FTP brass.
DC Electric, 12-2×2′ lead . 110VAC – 14-3 SJO plug
Capacity: Gas 55,000 BTUs input – 44,500 BTUs output @ maximum burn at 8.5 WCI manifold pressure.
15,000 BTUs input – 12,500 BTUs output @ low burn at 1.2 WCI manifold pressure
(88° F temperature rise / gallon / minute continuous flow at high burn)
1-1500Watt/5100 BTU-110 Volt element
Gas Train: Burner: 12 element high primary air, atmospheric type with stainless steel flame strips.
Aluminum manifold with brass pressure tap.
Orifices: Brass # 71 x 12. Gas Valve.
Redundant solenoid with integral regulator
Water Assembly: Heat exchangers: solid copper
Hook- ups, 1/2″ OD copper tubes.
Water line – brazed hard copper.
PRV: Approved set @ 35 PSI.
Optional: Engine Assist and Hot Tap Dispenser
Venting: Power vent, proofing, terminating to 2” exhaust through floor of vehicle.
Construction: Stainless steel case.
Modular – 3 assemblies – gas, electronics and water.
Case & flue assembly are 18 gauge welded stainless steel.
Component access is through front access panel.
Fuel: Propane at 11 WCI Power: 12 VDC at 4.5 Amp full operation. (Operating range 10.5 – 15 VDC)
Flue Gas Temperature: Under 300° F
Water Temperature: Potable water is tempered and temperature can be field adjusted for 100-145 degrees F.
1/4” threaded studs mounted on shock absorbing cushions bolted through coach floor.
Must be mounted in accordance with local codes or in absence of local codes: Manufactured Home Standard, Title 24 CFR, Part 3280 or Recreational Vehicle Standard ANSI A 119.2/NFPA501C
Safety Features: Pilotless.
Flame rectification.
Gas valve shuts off in .8 second if there is a flame outage.
Redundant gas solenoid.
Electronic high temperature shut-off (two).
ECO high temperature shut off at 212°F with auto reset.
Pressure relief valve @ 25 PSI.
Power vent with proofing.
Due to continuous product improvement, PrecisionTemp reserves the right to change specifications at any time.

For a period of One Year from the date of purchase, all integral parts of the TwinTemp are warranted to be free from defects in materials or workmanship. Defective parts will be repaired or replaced at the manufacturer’s sole discretion, free of charge for labor and parts. Peripheral components which may have been supplied by PrecisionTemp such as blowers and thermostats are covered by the component manufacturer and/or the manufacturer of the coach.

Click to view the complete TwinTemp Junior warranty terms