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INSTASHOWER ULTRA
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InstaShower Ultra combines 66,000 BTU output, up to 3.9 GPM flow and a built-in mixing tank designed to reduce cold-water interruption. Segmented combustion targets steady outlet temperature. Includes the white 15 × 15-inch exterior access door for matching openings and trim coverage.
View all features ↓Best for high-demand travel, colder inlet water and customers prioritizing the strongest flow plus mixing-tank comfort.
Includes the white 15 × 15-inch exterior access door for matching openings and trim coverage.
Gas, water and electrical connection materials vary by RV.
Which exterior door is included?
Includes the white 15 × 15-inch exterior access door for matching openings and trim coverage.
What does the mixing tank do?
It buffers and blends water to reduce brief cold-water interruption when shower flow changes.
Does it need 120V power?
Controls and ignition use 12V DC; the burner uses LP propane. No 120V supply is required.
Pair the water-heater upgrade with climate equipment matched to the RV roof and duct layout.
Add stronger propane heat through a furnace matched to the RV cabinet and central duct system.
Check furnace fit and options
This InstaShower Ultra package combines 66,000 BTU, up to 3.9 GPM, a built-in mixing tank and a ±1°F target with the included white 15 × 15-inch exterior door.
Ultra is not only a larger burner. Its water path and staged combustion are designed around temperature stability during real use.
The internal pre-mix system blends water before it leaves the heater, reducing the brief cold interruption that can happen in an RV plumbing loop.
Lower flame staging helps reduce overheating in warm conditions, while the full burner supports colder inlet water and higher demand.
Ultra provides the strongest flow platform in the range, with delivered flow shaped by inlet-water temperature and temperature rise.
Correct propane, ventilation, 12V power and winterization remain essential for safe operation.
This package combines the highest-flow Fogatti platform with a white 15 × 15-inch door for matching exterior openings.
The 3.9 GPM platform adds more headroom for couples and families who use hot water often.
It is designed to reduce cold-water interruption when the shower stops and restarts.
The white 15 × 15-inch door combines the finish with matching exterior coverage for the RV opening.
Includes the white 15 × 15-inch exterior access door for matching wall openings and trim coverage.
Includes the white 15 × 15-inch exterior access door for matching openings and trim coverage.
Choose Ultra for the 3.9 GPM platform and mixing tank with the included white 15 × 15-inch door.
For maximum flow, tighter control and a measured 15 × 15-inch white-door replacement.
For regular shower use, up to 3.1 GPM and a ±1°F stability target.
For continuous hot water and everyday midsize-RV shower demand.
Mixing-tank operation, full retrofit and owner performance in three practical videos.
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A complete installation walkthrough covering the opening, connections and first hot water.
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An internal look at the parts designed to improve shower stability and service access.
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A practical review focused on cold-water interruption and shower consistency.
See how the included 15 × 15-inch white door, 3.9 GPM platform and utility setup support the upgrade.
It blends water inside the heater to reduce the brief cold interruption that can occur when an RV shower stops and restarts.
Ultra provides up to 3.9 GPM; delivered flow varies with inlet-water temperature, water pressure and the requested temperature rise.
Includes the white 15 × 15-inch exterior access door for matching openings and trim coverage.
Controls and ignition use 12V DC; the burner uses LP propane. No 120V supply is required.
Standard RV water, LP propane, 12V, venting and weather-sealing connections. Use a qualified installer when local rules or experience require it.
Choose the white 15 × 15-inch package above. The installation guide is available for final fit planning.
This product is rated 5.0 of 5.0 stars.
It has received 20 reviews.
