INSTASHOWER 9 PRO
66K BTU RV Water Heater with Mixing Tank
$699.99
$799.99
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Higher flow with a mixing tank for steadier everyday use.
InstaShower 9 Pro combines 66,000 BTU output, up to 3.6 GPM flow and a built-in mixing tank designed to reduce temperature swings. It is the stronger fit for larger fifth wheels, Class A and Class C motorhomes, full-time RV living and households with heavier back-to-back hot-water demand.
View all features ↓Best for larger rigs or heavier back-to-back hot-water demand where mixing-tank stability matters.
66,000 BTUHigh-output propane heating
Up to 3.6 GPMFlow for heavier RV hot-water demand
Built-in mixing tankHelps smooth temperature changes
Up to 9,800 ftHigh-altitude operating design
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30-day returns
Free contiguous U.S. shipping
2-year warranty
Choose your InstaShower
CURRENT MODEL
InstaShower 9 Pro
66K BTU · up to 3.6 GPM
Choose 9 Pro whenA larger rig or heavier back-to-back demand benefits from mixing-tank stability.
InstaShower 8 Plus
55K BTU · up to 2.9 GPM
Choose 8 Plus whenBalanced everyday family shower flow is enough for a mid-size trailer or Class C.
InstaShower 7
48K BTU · up to 2.5 GPM
Choose 7 whenA compact RV and lighter one-fixture demand make right-sized output the better value.
Fit and installation
- Minimum clear opening
- 13 × 13 in
- Door options
- 15×15 / 15×18 / 18×18 in
- Fuel
- LP propane
- Electrical supply
- 12V DC
- Water connections
- 1/2 in inlet and outlet
- Water pressure
- 14.5–150 PSI
- weight
- 25.6 lbs / 11.6 kg
Match the selected door and trim to the existing exterior opening, then confirm plumbing, propane, 12V wiring and vent clearance.
What’s included
- ✓Water heaterInstaShower 9 Pro with built-in mixing tank
- ✓Access doorSelected color and door-size configuration
- ✓Decorative trimMatching exterior finishing components for the selected configuration
- ✓ControllerWired digital temperature controller
- ✓Safety hardware150 PSI pressure-relief valve and connection components
- ✓DocumentationInstallation hardware and user manual
Package contents follow the selected door-size and color variant.
Specifications
- Heat input
- 66,000 BTU
- Maximum flow
- Up to 3.6 GPM
- Temperature range
- 95–123°F
- Temperature stability
- ±1°F target
- Mixing tank
- Built in
- Fuel
- LP propane
- Electrical supply
- 12V DC
- Maximum altitude
- 9,800 ft
Quick answers
Who should choose 9 Pro?
It is best suited to larger rigs, full-time use and households that want more flow plus a mixing tank for steadier temperature behavior.
Does the mixing tank store a full shower?
The built-in mixing tank acts as a small buffer for smoother delivery while the heater produces hot water on demand.
Which door size should I select?
Choose the variant that covers the existing exterior opening and matches the required cutout and trim.
Recommended for larger RVs
For larger fifth wheels and Class A/C motorhomes, choose climate products sized for bigger cabins and central duct systems.
18K cooling and a 16K heat pump suit larger cabins and changing-weather travel. Choose the ducted or non-ducted configuration that matches the RV roof and ceiling.
Choose configuration
Variable 17K–35K output and 260 CFM airflow fit larger central-duct systems. Confirm cabinet size, duct capacity, exhaust, propane and 12V power.
View furnace fit
InstaShower 9 Pro
Checkout code--:--:--
$699.99
$799.99
Save $100.00
HIGH-FLOW HOT WATER WITH A MIXING TANK
Steadier hot water for larger RVs
InstaShower 9 Pro combines 66,000 BTU output, up to 3.6 GPM flow and a built-in mixing tank. It is designed for larger fifth wheels, Class A and Class C motorhomes, full-time RV living and households with heavier back-to-back demand.
66,000 BTUHigh-output propane heating
Up to 3.6 GPMHeavier hot-water demand
Mixing tankHelps reduce temperature swings
Up to 9,800 ftHigh-altitude operation
More flow for frequent hot-water use
9 Pro combines higher output, seasonal combustion control and a small mixing tank for steadier delivery under demanding RV use.
MIXING-TANK STABILITY
Smooth temperature changes with a small buffer
The mixing tank works with the burner and controls as a buffer for smoother on-demand delivery.
3.6 GPM PLATFORM
Add flow margin for larger households
The 66K platform is the strongest of these three models, with delivered flow shaped by incoming-water temperature and pressure.
SEASONAL COMBUSTION
Adjust output as incoming water changes
Using fewer flame rows in warm conditions and more in cold conditions helps avoid excessive heat while preserving winter output.
WIND + ALTITUDE
Support exposed and high-altitude campsites
The system is designed for operation up to 9,800 ft and stronger wind resistance when installation and utilities are correct.
WHO SHOULD CHOOSE 9 PRO?
Choose it for real household demand
The strongest fit is a larger rig or a household whose shower and sink demand regularly pushes a lower-output heater.
Larger fifth wheels and motorhomes
More cabin space often means more occupants and more frequent hot-water use.
Full-time or extended-stay RV living
The mixing tank and higher flow matter more when the heater is used every day.
Cold incoming water or demanding routes
More burner output provides additional recovery margin when source water is colder.
Opening and exterior-door compatibility
Choose 15×15, 15×18 or 18×18 from the existing opening; the guide covers LP propane, 12V, water and venting.
FIT AT A GLANCE
Opening, door coverage and utility routing
The heater is designed around a 13 × 13-inch minimum opening with several exterior door options.
- Minimum opening
- 13 × 13 in
- Door options
- 15×15 / 15×18 / 18×18 in
- Water pressure
- 14.5–150 PSI
- Utilities
- LP propane + 12V DC
- Water connections
- 1/2 in inlet / outlet
The 18 × 18-inch door provides broad coverage for many former 10-, 12- and 16-gallon tank openings.
Choose by household flow and fit
7 suits compact demand, 8 Plus balances flow and value, and 9 Pro adds the mixing tank and 3.6 GPM platform.
InstaShower 9 Pro
For larger rigs, full-time use and heavier back-to-back demand.
- Heat input
- 66K BTU
- Flow
- Up to 3.6 GPM
- Best for
- Larger rigs / heavier use
InstaShower 8 Plus
For mid-size travel trailers and Class C RVs with regular family shower use.
- Heat input
- 55K BTU
- Flow
- Up to 2.9 GPM
- Best for
- Travel trailers / Class C
InstaShower 7
For compact RVs, warm-weather travel and lighter single-fixture demand.
- Heat input
- 48K BTU
- Flow
- Up to 2.5 GPM
- Best for
- Compact RVs / lighter use
See 9 Pro performance and installation
Product operation, retrofit installation and winterization in three practical videos.
▶INSTALLATION
See the full tankless replacement sequence
Connections, wiring, mounting, sealing and first startup.
▶MAINTENANCE
Drain and protect the heater correctly
Review the drain and winterization process before freezing weather.
▶REAL-WORLD INSTALL
Watch an RV tankless installation and test
A practical view of removing a tank heater, installing the unit and checking operation.
Why InstaShower 9 Pro fits higher hot-water demand
These answers cover the mixing tank, simultaneous use, fit and utility requirements.
Does the mixing tank store a full shower?
The built-in mixing tank acts as a small buffer for smoother on-demand delivery; the burner produces hot water continuously as it is used.
Can I run the shower and sink together?
The 3.6 GPM platform supports higher demand; delivered flow varies with inlet temperature, pressure and fixture flow.
Will it replace a 6- or 10-gallon tank heater?
It is designed around a common 13 × 13-inch opening. Select the door and trim that properly cover the previous exterior opening.
Does it require shore power?
Controls and ignition use 12V DC while the burner uses LP propane, so no 120V shore-power supply is required.
Who should choose 8 Plus instead?
Choose 8 Plus for moderate demand when its 2.9 GPM platform is the better value for the RV and household.
Ready for higher-demand RV hot water?
Choose the matching door size above. The installation guide is available for final fit planning.
This product is rated 5.0 of 5.0 stars.
It has received 107 reviews.