Topargee H2F-SM Surface Mount Water Tank Gauge

Monitor your RV freshwater supply without relying on unreliable factory tank sensors. The Topargee H2F-SM Surface Mount Water Tank Gauge gives you accurate water usage and remaining tank capacity on a compact LCD display that mounts with a bracket, screws, or double-sided tape.

Full Product Description

The Topargee H2F-SM Surface Mount Water Tank Gauge is a practical freshwater monitoring upgrade for RVs, travel trailers, motorhomes, boats, vans, and off-grid water systems.
Instead of using probes inside the tank, the Topargee H2F-SM measures water as it flows through the fresh water line. The gauge counts down from your programmed tank capacity and shows how much water remains, helping you manage your fresh water supply with more confidence.
This surface-mount version is a great choice for DIY installations because it does not require cutting a large flush-mount opening. The display can be mounted in its cradle using double-sided tape, screws, or a bracket-style installation, making it easy to place in a cabinet, utility compartment, control panel area, or another convenient location. Topargee describes the H2F-SM as a compact, space-saving gauge powered by AA batteries, with no external power required.
The H2F-SM displays readings in gallons or liters, stores your pre-set tank capacity in memory, and provides live readings as water flows through the system. It is especially useful for boondocking, dry camping, marine use, van builds, and any setup where fresh water management matters.

Key Features

• Surface mount design for easy aftermarket installation
• Compact LCD screen
• Displays water remaining in gallons or liters
• Measures water through an inline flow sender
• No drilling into the water tank
• Powered by AA batteries
• No external power required
• Mounts with cradle, screws, bracket, or double-sided tape
• Stores the programmed tank capacity in memory
• Programmable for different tank sizes
• Great for RVs, trailers, boats, vans, and off-grid systems
• Ideal for dry camping and boondocking
• Sender lead included
• Extension leads available separately

Why RVers Like It

Factory RV tank monitors often give rough readings, and many RV owners do not fully trust them. The Topargee H2F-SM gives RVers a more useful way to monitor fresh water by measuring water flowing through the system rather than relying on tank wall sensors.

That means you can better understand your water usage during showers, dishwashing, handwashing, and daily camping routines. For dry camping and boondocking, knowing how much water remains can help you stretch your supply and avoid unnecessary refill trips.

The surface-mount design is also appealing because it is simple to install and does not require a large cutout like a flush-mount gauge. It is a good choice for RVers who want a permanent display but still want an easier, DIY-friendly installation.

The Topargee H2F-SM Surface Mount Water Tank Gauge helps RVers monitor fresh water usage and remaining tank capacity with a compact surface-mounted LCD display. It installs in the water line, requires no tank drilling, and is powered by AA batteries with no external power required. Ideal for RVs, trailers, boats, vans, and off-grid water systems.

Specifications

Topargee lists the Surface Mount Gauge as a compact AA-battery-powered model with a standard screen, 4 ft 6 in sender lead, gallon/liter display, and hose connectors sold separately.

Installation Notes

The Topargee H2F-SM sender installs in the RV’s fresh water line. Since the sender measures water flow through the line, there is no need to drill into the tank or install probes inside the tank.

The display can be mounted on a surface using the included cradle, double-sided tape, screws, or a bracket-style setup, depending on the installation location. This makes it a good option for cabinets, utility compartments, control areas, or compact RV spaces where a flush-mounted gauge may not be ideal.

Topargee notes that hose connectors are not included, and compatible plumbing fittings may be required.  Additional fittings needed 2 x 1/2" BSP Female to 1/2" NPT Male adapters, or other standard-compatible plumbing fittings.

Important: Topargee states that extension leads must be used if extra length is needed, and extension/sender leads should not be cut or joined because doing so can void the warranty.

Best For

• RVers who want an easy aftermarket water gauge upgrade
• Travel trailers and fifth wheels
• Motorhomes
• Camper vans and van builds
• Boats and marine freshwater systems
• Off-grid water systems
• Dry camping and boondocking
• RV owners who do not want to cut a flush-mount opening
• Anyone tired of guessing how much fresh water is left

FAQ Section

How does the Topargee H2F-SM measure water?

The H2F-SM uses an inline sender installed in the fresh water line. It measures water as it flows through the system and displays the remaining amount on the surface-mounted LCD screen.

Does the H2F-SM require drilling into the water tank?

No. The sender installs in the water line, so there is no need to drill into the tank or install probes inside the tank.

Is the Topargee H2F-SM battery powered?

Yes. The H2F-SM is powered by AA batteries and does not require external 12-volt power.

Can it display gallons instead of liters?

Yes. The H2F-SM can display readings in either gallons or liters.

What is the difference between the H2F-SM and H2F-FM?

The H2F-SM is a surface-mount gauge that is easier to install and does not require a recessed cutout. The H2F-FM is a flush-mount gauge designed for a cleaner built-in look and uses 12-volt hardwired power.

What is the difference between the H2F-SM and H2F-BT12?

The H2F-SM uses a physical LCD display mounted inside the RV or boat. The H2F-BT12 is the Bluetooth version that displays water information on a smartphone app.

Are plumbing fittings included?

No. Hose connectors are not included. You will need 2 BSPP 1/2 Adapters for the Flow Control - Use this Link to Purchase. 
Not all RVs are plumbed the same; each installation will require at a minimum the BSPP adapters and 2 Flair-It or Best Pex Fittings. Use this link to Purchase.

Can the sender lead be extended?

Yes. Extension leads are available separately. Topargee notes that proper extension leads should be used if extra length is needed, and the sender or extension leads should not be cut or joined.

The Topargee H2F-SM Surface Mount Water Tank Gauge is a smart upgrade for RVers who want better fresh water tracking without a complicated installation. It gives you a clear display, flexible mounting options, and better control over your water supply—especially when camping away from hookups.