InstaShower 9 Pro Rv Tankless Water Heater Review: 3.6 GPM of Hot Water Flow

InstaShower 9 Pro Overview

FOGATTI InstaShower 9 Pro provides a 3.6 GPM hot water flow rate for users who need to provide hot water for a family of four.

Operating at altitudes up to 9,800 feet means this unit maintains consistent flow where thinner air often causes standard heaters to shut down. This makes the rv tankless water heater (recreational vehicle tankless water heater) reliable for high-elevation camping.

The FOGATTI InstaShower 9 Pro reaches this performance through a 66,000 BTU output. Because it meets the 60,000 BTU threshold required for high-altitude consistency, it provides reliable heat in extreme environments.

We selected this model from 38 rv tankless water heaters we screened because it is one of 15 chosen for a full review. Full reviews go to the most-rated products that pass screening, at most 2 per brand; this one has 247 buyer ratings, the 6th most of the 38 screened. Our research focuses on listing data and specifications rather than physical testing or handling. This review is for upgraders who travel to high-altitude locations.

The Short Answer on the InstaShower 9 Pro

Best for: you need a high-flow system that maintains consistent performance at high altitudes or in extreme cold.

The InstaShower 9 Pro is a reliable upgrade for around $899.99.

• Pro: The 66,000 BTU output provides enough heat to maintain a steady shower for a family of four.
• Pro: A 3.6 GPM flow rate supports high-volume needs like van life or truck camper showers.
• Pro: The mixing tank stabilizes temperature to prevent sudden fluctuations during use.
• Con: The 13″x13″ opening is smaller than the 15″x15″ standard RV mounting footprint.

Don’t buy this if: your existing installation requires a 15″x15″ door footprint, as this unit features a 13″x13″ opening.

Price assessment: The $899.99 price point is fair for a 3rd generation unit with 66,000 BTU and a dedicated mixing tank.

For a high-capacity option, read our spec breakdown of the RVGBD-1518 Water Heater.

Technical Specifications for this Rv Tankless Water Heater

The 3.6 GPM flow rate measures the volume of water delivered per minute, which is sufficient to provide a steady shower for a family of four.

You can also find the best rv tankless water heater with 15×15 door options for your specific layout.

Before You Buy: Rv Tankless Water Heater Checklist

The first thing to check is your existing mounting dimensions to ensure the unit fits your current setup.

• ☐ Confirm your opening size is at least 13″x13″ — a smaller opening will require you to cut the fiberglass housing to fit the unit.
• ☐ Verify your current tank is a 10-gallon model — this unit is compatible with 10-gallon tanks, but you must confirm your specific tank’s 18″x18″ door retrofit requirements.
• ☐ Measure your required flow rate — the 3.6 GPM output provides enough volume for a family of four, but a higher-pressure shower head could cause a flow rate drop if it exceeds the heater’s capacity.
• ☐ Check your installation’s drainage path — improper drainage leads to internal moisture buildup and premature electronics failure.
• ☐ Budget for the $899.99 price point — this is the cost to replace your current Suburban or Atwood 6-gallon tank heater.

You should not buy the InstaShower 9 Pro if your shower head’s pressure requirements exceed the capacity of a 66,000 BTU system.

What These Specifications Let You Do

Dual Flame Configuration for Seasonal Use

The FOGATTI InstaShower 9 Pro handles a shower in freezing winter temperatures by using five rows of flames for winter use. This configuration provides the 66,000 BTU output required to maintain hot water flow when the external environment is at its coldest. You can rely on this heating capacity to provide a steady shower for a family of four, as the 3.6 GPM flow rate exceeds the 2.5 GPM threshold needed for that workload.

InstaShower 9 Pro also includes two rows of flames for summer use, which provides a different heat output for milder weather. This dual-configuration allows the unit to provide hot water for a truck camper or van life shower without over-taxing the system during periods of lower demand. Because the unit provides 66,000 BTU, it provides enough power to run a shower for 10 minutes without a flame out, even in extreme conditions.

High Pressure NIDEC Fan Performance

You can take your RV to altitudes up to 9,800 feet without the water getting cold because the unit is rated for that specific height. The 66,000 BTU output is at or above the 60,000 BTU figure required to maintain consistent flow rates at high altitudes or in extreme cold. This ensures that the heating capacity remains sufficient even as the air thins and the ambient temperature drops during high-elevation camping.

The NIDEC fan delivers 300Pa of power, which helps move air through the heat exchanger to maintain the 3.6 GPM hot water flow rate. This specific fan power allows the heater to function in winds up to 9 on the Beaufort scale, providing a stable heat source in gusty conditions. While the 300Pa rating defines the fan’s pressure, it is the 66,000 BTU rating that determines the total heat energy produced per hour to keep your water hot.

How a mixing tank provides precise temperature stabilization

InstaShower 9 Pro provides temperature control within 1 degree to ensure consistent water heat during your shower. This precision is supported by a mixing tank, which is a reservoir that blends hot and cold water to prevent sudden temperature spikes or drops. By stabilizing the output, the mixing tank ensures that the 3.6 GPM flow remains at a steady temperature from the start of your shower to the end.

The mixing tank is one of only 6 of the 38 screened listings to state this feature, providing a buffer that many other models lack. Because it stabilizes the flow, you can enjoy a consistent experience even if your water pressure fluctuates slightly. This hardware allows the unit to maintain a steady stream of hot water, making it suitable for a quick shower where consistent heat is the priority.

The InstaShower 9 Pro Job by Job: What Its Figures Cover

The InstaShower 9 Pro against the jobs buyers ask about, worked out from its listed BTU output and flow rate and a typical need for each job.

The InstaShower 9 Pro Against Similar Rv Tankless Water Heaters

The InstaShower 9 Pro provides a 3.6 GPM hot water flow rate, which exceeds the 2.5 GPM required to provide a steady shower for a family of four. Because it provides more volume than many standard 6-gallon tank units, you do not have to wait for water to heat up.

Choosing a unit with insufficient BTU output can result in a flow rate drop, where the heater shuts off or provides cold water if the shower head pressure exceeds the unit’s capacity. The InstaShower 9 Pro provides 66,000 BTU, which is enough to maintain hot water at 10,000 ft elevation and run a 10-minute shower without a flame out.

The InstaShower 9 Pro ranks first in buyer ratings among the 6 models compared, with a 4.5 average from 247 ratings. It holds the largest BTU output tied with the FOGATTI FS10B1S.

• The amzchef 65,000 BTU Propane RV Water Heater is $160.99 cheaper than the InstaShower 9 Pro.
• The RUNSAIL RV Tankless Water Heater provides a larger 3.96 GPM flow rate.
• The FOGATTI FS10B1S Tankless Water Heater matches the InstaShower 9 Pro’s 66,000 BTU and 15″x15″ door size.
• The VEVOR RV Tankless Water Heater is $200 cheaper than the InstaShower 9 Pro.
• The CAMPLUX RV Tankless Water Heater provides a larger 3.9 GPM flow rate.

If you prioritize a lower purchase price over the highest buyer rating, the VEVOR RV Tankless Water Heater is a cheaper alternative.

If you are looking for a slightly different model, see our full InstaShower 8 Plus review.

If you aren’t ready to switch, explore various alternatives to an rv tankless water heater.

Setting Up This Rv Tankless Water Heater, and What Support Covers

Setting up the InstaShower 9 Pro

You must have a gas supply connection and a water source ready before the InstaShower 9 Pro can be installed.

1. Mount the unit to a surface that can support the weight of the heater and its components.
2. Connect the 13″x13″ opening to your existing plumbing lines.
3. Attach a pressure regulator to the gas inlet to maintain consistent gas flow and prevent flame outs.
4. Install a condensate drain hose to prevent moisture buildup and internal corrosion.
5. Connect the remote controller to the unit to allow for temperature adjustment from outside the unit.

Warranty and support: what to check

Warranty coverage and support terms vary by seller and country.

• Confirm the 66,000 BTU output meets your specific flow requirements to prevent a flame out during high-demand use.
• Verify that the NIDEC fan is functioning to provide 300Pa of power for proper ventilation.
• Check that the mixing tank is properly seated to ensure temperature stabilization.

Test the unit for a full five-minute cycle the day it arrives to verify the 3.6 GPM flow rate while the return window is still open.

InstaShower 9 Pro Buying Questions Answered

How does the InstaShower 9 Pro perform at high altitudes?

The InstaShower 9 Pro operates at altitudes up to 9,800 feet because it provides 66,000 BTU of heat. This output is sufficient to maintain consistent hot water flow even in extreme cold or high-elevation environments.

Can the InstaShower 9 Pro provide enough water for a large family?

Yes, the InstaShower 9 Pro provides a 3.6 GPM hot water flow rate, which supports a steady shower for a family of four. This volume ensures that multiple users can share the water supply without a significant drop in flow.

Is the InstaShower 9 Pro compatible with my existing tank heater?

The InstaShower 9 Pro replaces Girard and Furrion tankless water heaters, but it also works with 10-gallon tank water heaters if you perform an 18″x18″ door retrofit. You should measure your current door dimensions to confirm if the 13″x13″ opening fits your specific setup.

Does the InstaShower 9 Pro have a remote control?

Yes, the InstaShower 9 Pro includes a remote control for operation. This allows you to manage the water heater settings without needing to access the unit directly during use.

How does the InstaShower 9 Pro handle different weather conditions?

The InstaShower 9 Pro functions in winds up to 9 on the Beaufort scale. It also features a mixing tank, which is a component that blends hot and cold water to stabilize the temperature before it reaches the shower head.

New users should first learn how an rv tankless water heater works.

Is the InstaShower 9 Pro Right for You?

Who the InstaShower 9 Pro suits and the jobs it is the wrong choice for, listed below with the reason for each.

Where to Buy This Rv Tankless Water Heater

When we looked in November 2026, the InstaShower 9 Pro was listed at $899.99 – a snapshot that may have changed since.

Rv tankless water heaters are sold by the retailers below – we do not track which of them has the InstaShower 9 Pro in stock, so check availability and the current price with the retailer before making a trip.

• eBay (online only) — open-box and refurbished stock
• Amazon (online only) — wide selection of brands and consumer reviews
• Camping World (online and physical stores) — large physical footprint and specialist staff
• REI (online and physical stores) — outdoor gear expertise and in-store returns
• RVStore (online only) — specialist retailer for RV components and accessories
• Walmart (online and physical stores) — accessible pricing and physical store availability

Final Verdict on the InstaShower 9 Pro

If you are upgrading from a traditional tank heater to a modern system, the InstaShower 9 Pro is a high-capacity choice for around $899.99. This 3rd generation rv tankless water heater provides 66,000 BTU of heating capacity, which is enough to maintain hot water at 10,000 ft elevation. It also delivers a 3.6 GPM hot water flow rate, allowing you to provide a steady shower for a family of four or a high-volume van life shower.

The InstaShower 9 Pro includes a mixing tank, which is a reservoir that blends hot and cold water to stabilize the temperature before it reaches the shower head. This feature helps prevent the sudden temperature swings that can occur with some tankless units. The unit also features two rows of flames for summer use and five rows of flames for winter use to manage heat output based on the season.

For installation, you should confirm your current setup’s dimensions. The unit features a 13″x13″ opening and is designed to replace Suburban and Atwood 6-gallon tank water heaters. If you are using a 10-gallon tank water heater, you can use an 18″x18″ door retrofit to accommodate the unit. Because this is a gas-powered installation, you must have a qualified installer perform the work to ensure it meets local safety regulations.

You should choose the InstaShower 9 Pro if you need a high-output system that handles extreme cold and high altitudes. The 66,000 BTU rating provides the heat energy necessary to prevent a flow rate drop when using high-pressure shower heads in harsh environments.

If you need a high-output system that handles extreme cold and high altitudes, the InstaShower 9 Pro is a strong option at the $899.99 price point. It provides the necessary 66,000 BTU to maintain consistent flow even in the coldest conditions.

The 3.6 GPM flow rate is a significant data point, as it provides more than enough volume for a family of four or a high-volume truck camper shower. Additionally, the unit holds a 4.5 rating from 247 buyers, reflecting a consistent experience for those who have installed it.

Skip it if: You have a mounting space smaller than a 13″x13″ opening or if your existing 10-gallon tank heater does not support an 18″x18″ door retrofit.