INSTASHOWER 8 PLUS
55K BTU RV Tankless Water Heater
$569.99
$699.99
Save $130.00
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Summer57
A straightforward upgrade from a limited tank heater.
InstaShower 8 Plus delivers 55,000 BTU output and up to 2.9 GPM of continuous hot water. It supports common replacement-door sizes, winter freeze protection and high-altitude operation for everyday RV travel.
View all features ↓Best for mid-size travel trailers and Class C RVs with regular family shower demand and a straightforward tankless replacement.
55,000 BTUOn-demand propane heating
Up to 2.9 GPMContinuous hot-water flow
95–123°FSelectable outlet temperature
Up to 9,800 ftHigh-altitude operation
Secure checkout
More options available at checkout
30-day returns
Free contiguous U.S. shipping
2-year warranty
Choose your InstaShower
CURRENT MODEL
InstaShower 8 Plus
55K BTU · up to 2.9 GPM
Choose 8 Plus whenA mid-size trailer or Class C needs balanced everyday family shower flow.
InstaShower 7
48K BTU · up to 2.5 GPM
Choose 7 whenA compact RV and lighter one-fixture use make lower output the better fit.
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.
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
- Maximum altitude
- 9,800 ft
- Size
- 15 × 15 × 14.3 in
- Weight
- 25.6 lbs / 11.6 kg
Choose the door from the opening and exterior trim; the guide covers water, LP propane, 12V and venting.
What’s included
- ✓Water heaterFogatti tankless RV water heater
- ✓Access doorSelected color and door-size configuration
- ✓ControllerWired digital controller
- ✓Safety hardwarePressure-relief and connection components
- ✓DocumentationInstallation hardware and user manual
Package contents follow the selected configuration and variant.
Specifications
- Heat input
- 55,000 BTU
- Maximum flow
- Up to 2.9 GPM
- Temperature range
- 95–123°F
- Fuel
- LP propane
- Electrical supply
- 12V DC
- Minimum opening
- 13 × 13 in
- Maximum altitude
- 9,800 ft
Quick answers
When should I move up to 9 Pro?
Choose 9 Pro for a larger RV, heavier back-to-back use or when the mixing tank and 3.6 GPM platform better match the household.
Which door size should I choose?
Use the existing cutout and trim dimensions, not the old tank capacity alone.
Can it provide continuous showers?
Yes, provided propane, water pressure and flow remain within the product requirements.
Complete the RV comfort system
Add rooftop cooling or ducted heat selected for the RV roof, cabinet and utilities.
Add 15K rooftop cooling with a matching roof opening, ceiling layout and 115V circuit.
View rooftop fit
Add balanced propane heat with a furnace matched to the existing cabinet and duct system.
View furnace fit
InstaShower 8 Plus
Checkout code--:--:--
$569.99
$699.99
Save $130.00
THE BALANCED TANKLESS UPGRADE
Balanced hot water for everyday RV travel
InstaShower 8 Plus delivers 55,000 BTU and up to 2.9 GPM for mid-size travel trailers, Class C motorhomes and households that use hot water regularly but do not need the 9 Pro mixing tank.
55,000 BTUBalanced propane output
Up to 2.9 GPMRegular family shower use
84%Rated efficiency
Up to 9,800 ftHigh-altitude operation
More shower margin than the entry model
8 Plus focuses on continuous showers, common replacement openings and enough output for everyday family use.
CONTINUOUS SHOWERS
Replace tank recovery waits with continuous hot water
As long as propane, pressure and flow remain within the product requirements, the shower is not limited to six or ten stored gallons.
2.9 GPM PLATFORM
Use 2.9 GPM for regular family showers
It is aimed at regular shower use in travel trailers and Class C RVs without paying for the 9 Pro mixing tank.
STAGED COMBUSTION
Adjust burner output as water conditions change
Segmented combustion helps control heat output instead of forcing one fixed flame level across summer and colder travel.
COMMON RETROFIT SIZES
Choose the door that covers the old opening
Choose 15 × 15, 15 × 18 or 18 × 18 based on the actual exterior coverage required.
WHO SHOULD CHOOSE 8 PLUS?
The balanced choice for mid-size RVs
Its 2.9 GPM platform adds flow margin for regular family showers in mid-size rigs.
Travel trailers and Class C RVs
The output aligns well with common mid-size interiors and everyday shower demand.
Couples or small families
It provides more flow margin for repeated showers and routine sink use.
Owners replacing a 6- or 10-gallon tank
Multiple door sizes support a cleaner tank-to-tankless retrofit.
Door options for common RV water-heater openings
Choose 15×15, 15×18 or 18×18 from the existing opening; the guide covers water, LP propane, 12V and venting.
FIT AT A GLANCE
Cutout, trim and utility requirements
The same heater can be ordered with several exterior door sizes for common replacement jobs.
- Minimum opening
- 13 × 13 in
- Door options
- 15×15 / 15×18 / 18×18 in
- Water pressure
- 14.5–116 PSI
- Utilities
- LP propane + 12V DC
- Product size
- 15 × 15.4 × 15 in
A 15 × 15-inch door commonly replaces a 4/6-gallon tank opening; larger existing openings may require 15 × 18 or 18 × 18 coverage.
Choose flow from household demand
8 Plus is the balanced middle. 7 suits lighter use, while 9 Pro adds the mixing tank and more flow for larger rigs.
InstaShower 8 Plus
For regular family shower use in travel trailers and Class C RVs.
- Heat input
- 55K BTU
- Flow
- Up to 2.9 GPM
- Best for
- Travel trailers / Class C
InstaShower 7
For compact rigs, warm climates and lighter hot-water demand.
- Heat input
- 48K BTU
- Flow
- Up to 2.5 GPM
- Best for
- Compact RVs / lighter use
InstaShower 9 Pro
For larger RVs, full-time use and heavier demand with a mixing tank.
- Heat input
- 66K BTU
- Flow
- Up to 3.6 GPM
- Best for
- Larger rigs / heavier use
See InstaShower 8 Plus in real RV use
Product overview, full retrofit and official installation guidance in three practical videos.
▶PRODUCT REVIEW
See the 8 Plus features and replacement fit
A close look at output, door options and where this model sits in the range.
▶TRAILER INSTALL
Watch an 8 Plus installed in a travel trailer
See the removal, connections, mounting, door and startup process in a real RV.
▶OFFICIAL GUIDE
Follow Fogatti’s step-by-step installation
Pre-assembly, utility connections, sealing and initial ignition checks.
Why InstaShower 8 Plus is the balanced everyday choice
These answers cover flow, door selection, high-altitude use and when to step up to 9 Pro.
How is 8 Plus different from 7?
8 Plus increases output to 55,000 BTU and flow to 2.9 GPM, giving regular family shower use more margin.
When should I choose 9 Pro?
Move up when the RV is larger, use is heavier or the built-in mixing tank and 3.6 GPM platform better match the household.
Can it replace a Suburban or Atwood tank heater?
It is designed for common replacement openings with door options that cover the exterior cutout and trim.
Can it operate at high altitude?
The product is designed for operation up to 9,800 ft when installed and supplied correctly.
Does it need a new propane system?
It uses LP propane and 12V DC with the line routing, regulator capacity and connections shown in the installation guide.
Ready for balanced on-demand hot water?
Choose the matching color and door size above. The installation guide is available for final fit planning.
This product is rated 4.9 of 5.0 stars.
It has received 181 reviews.