EPTech.WiFi.Plus Wi-Fi water tank level sensor

How to Know How Much Water Is in Your Tank: Manual Methods and Smart Level Meters in Jordan

February 18, 2026

Knowing how much water is in your tank is a weekly concern for many homes in Jordan. Most houses and apartment buildings store water in rooftop tanks, filled from a ground tank or straight from the network on the area's supply day, so if the tank runs dry before the next delivery, the taps stop. This guide covers manual checks, working out the liters, float switches, how Wi-Fi water level sensors measure, and how to install a tank level meter on a Jordanian rooftop tank.

Why it pays to know your tank level

In many areas of Jordan, water arrives on a rotation schedule, so what you store must last until the next turn. Guessing leads to familiar problems:

Running out suddenly: the tank empties in the middle of a shower or a wash cycle.
Overflow and waste: if the float valve sticks or a pump keeps running, a full tank overflows onto the roof.
Effort: repeated trips to the roof are tiring and can be unsafe in bad weather.
Poor planning: without a reading, it is hard to know when to order a water tanker or cut back on use.

Quick picks: tank level meters on our store

Model	How it connects	Listed measuring range	A strong choice for
EPTech.WiFi.Plus	Wi-Fi sensor straight to the Tuya Smart / Smart Life app	10 cm to 3 m	Rooftops with good Wi-Fi; several tanks in one account
EPTech.WiFiRF	400 MHz RF sensor to an indoor screen on Wi-Fi	10 cm to 3 m	Homes where Wi-Fi does not reach the roof
EPTech.WiFi.RF.Plus	400 MHz RF sensor to an indoor 4" LED screen on Wi-Fi	10 cm to 3 m	A wall screen plus the phone app
EPTech.WiFi.RF.10M	400 MHz RF sensor to an indoor screen with alarm buzzer, on Wi-Fi	10 cm to 10 m	Deep tanks and wells

How to know how much water is in your tank without a device

These methods cost nothing and are handy for double-checking a meter.

Measure with a stick

Open the lid and lower a clean stick, kept only for this job, to the bottom; the wet part is the water height. It is the most reliable manual method, but it means climbing to the roof, so close the lid firmly afterwards to keep dust and insects out.

Tap a metal tank or look for the water line

On steel or galvanized tanks, knocking down the side gives a hollow sound above the water and a duller one below it. Some lighter plastic tanks show a faint water line in strong sunlight, but many are opaque on purpose to limit algae. Both give only a rough idea.

Fit a clear sight tube

A clear vertical tube connected to the bottom of the tank through a small valve shows the same water height as the tank, since the two are connected. It needs a plumber, and clear tubes in the sun can grow algae.

Turn the water height into liters

Use the tank's inside dimensions in meters (1 cubic meter = 1,000 liters):

Upright round tank: liters = 3.14 × radius × radius × water height × 1,000. A tank 1.2 m across holds about 11.3 liters per 1 cm of water, so 80 cm of water is about 905 liters.
Rectangular tank: liters = length × width × water height × 1,000. A 1 m × 1 m tank with 50 cm of water holds about 500 liters.
Percentage: in an upright tank with straight sides, water height ÷ full height gives the share left.
Horizontal round tank: not linear; a quarter of the height is only about 20% of the volume.

Float valves and float switches: what they can and cannot tell you

The float valve on the inlet

Most rooftop tanks in Jordan have a float valve: a floating ball on an arm that closes the inlet when the tank is full. It prevents overflow but shows nothing about how much water is inside, and when it sticks the tank overflows.

Electric float switches

An electric float switch is a sealed float on a cable that tips at a set level and switches a circuit, typically to start and stop a pump or protect it from running dry. It only tells you "above" or "below" a point, not how many liters remain.

Multi-level probe indicators

Some wired indicators place contacts at fixed heights (quarter, half, three quarters, full) and light a lamp for each step, but need cables from the roof to the display.

How wireless and Wi-Fi tank level meters measure

Ultrasonic sensing

The meters on our store use an ultrasonic sensor mounted above the water and pointing down. It sends a sound pulse above human hearing and times the echo from the water. Sound travels through air at roughly 343 meters per second, so the time gives the distance to the water, and the tank depth minus that distance is the water height. Nothing touches the water. Ultrasonic sensors have a short blind zone in front of the sensor face; our models list a range starting at 10 cm, so the water at its fullest should stay more than 10 cm below the sensor.

Wi-Fi sensor straight to the phone

A Wi-Fi sensor joins your home network and sends readings to an app. It is the simplest setup, but it needs a usable Wi-Fi signal at the tank (most such sensors use 2.4 GHz only), and concrete roofs and walls often weaken it.

RF sensor with an indoor screen

In an RF model, the roof sensor talks to a screen inside the home over its own radio link (400 MHz on our models), and the screen joins your Wi-Fi so you can also check the phone. Lower frequencies generally pass through walls better than 2.4 GHz Wi-Fi, which suits tanks far from the router.

How to choose a water level sensor for your tank

Wi-Fi coverage on the roof

Stand next to the tank with your phone on your home Wi-Fi. If the signal is strong and stable, a Wi-Fi sensor is enough; if it is weak, choose an RF model with an indoor screen.

Tank depth

Most rooftop tanks are well under 3 m deep, so a 3 m range covers them. Deep tanks and wells need a longer range, such as the 10 m model.

Sensor material, alerts and display

Condensation on the sensor face causes false readings; the EPTech listings say their stainless-steel sensors reduce this compared with plastic sensors. Then decide whether a phone app is enough or the household needs a wall screen. Low-level and full-tank alerts are the most useful features.

Power and weather

All four meters run on 5V DC, so you need a power point near the tank with the adapter kept out of the rain, or a 5V solar panel. For protection, the EPTech.WiFi.Plus and EPTech.WiFi.RF.Plus listings state IP65, and the WiFi.Plus listing gives an operating range of -10°C to +70°C.

Tank material and liquid

Measuring from above, an ultrasonic sensor suits plastic, fiberglass, metal or concrete tanks with a clear view of the surface. The EPTech listings also cover diesel and other non-corrosive liquids.

Tank level meters available on our store

EPTech.WiFi.Plus: Wi-Fi sensor with external antenna

The EPTech.WiFi.Plus sends readings straight to the Tuya Smart / Smart Life app over your home Wi-Fi. Its listing describes a stainless-steel ultrasonic sensor (10 cm to 3 m), a detachable 5 dBi external antenna, low-level and full-tank alerts with custom thresholds, up to 10 tanks in one account, an IP65 rating, 5V DC power (USB adapter or optional solar panel) and top mounting with the included accessories.

Good for: roof tanks with decent Wi-Fi, and one person watching several tanks.

EPTech.WiFiRF: indoor screen plus RF sensor

The EPTech.WiFiRF pairs a stainless-steel ultrasonic sensor with an indoor display over 400 MHz RF, rated up to 200 m in open areas and up to ten floors inside buildings. You follow the level on the display or in the app. It measures up to 3 m deep and needs only power at the tank and Wi-Fi inside the house.

Good for: houses and buildings where Wi-Fi does not reach the roof.

EPTech.WiFi.RF.Plus: the newer screen and RF model

Listed as a new model, the EPTech.WiFi.RF.Plus links a stainless-steel ultrasonic sensor to an indoor 4" LED screen over 400 MHz RF (up to 200 m in open space, up to 10 floors in buildings), and the screen connects to 2.4 GHz Wi-Fi for the app. Its listing states IP65 and tank-top or wall mounting with the optional bracket.

Good for: families who want the level on a kitchen or hallway screen as well as on the phone.

EPTech.WiFi.RF.10M: for deep tanks and wells

The EPTech.WiFi.RF.10M measures from 10 cm to 10 m with a stainless-steel ultrasonic sensor. It uses a 400 MHz RF link (up to 200 m in open space, up to five floors inside buildings) to an indoor screen with an alarm buzzer that connects to 2.4 GHz Wi-Fi. Power comes from a 5V DC adapter or an optional solar panel.

Good for: deep ground tanks and wells with power nearby.

Accessories: wall bracket and solar panel

The stainless-steel wall-mount bracket holds a level sensor on a wall or vertical surface with a pipe clamp and an adjustable threaded rod. The 5V solar panel for tank meters has a monocrystalline panel, a built-in 6000mAh battery for steady output even at night, a 120° adjustable bracket and an IP66 rating.

Good for: wall-mounted sensors (bracket) and roofs without a nearby power point (solar panel).

Installing a level meter on a Jordanian rooftop tank

Check signal and power. Test Wi-Fi at the tank and plan where the 5V adapter plugs in, protected from rain; use a qualified electrician for new outdoor sockets.
Choose the spot. Give the sensor a clear view down to the water, away from the inlet, float valve, walls and internal ribs, which disturb the echo.
Respect the blind zone. The full-water level set by the float valve must stay more than 10 cm below the sensor face.
Mount it straight. Fit the sensor on the lid so it points straight down, and seal around it against dust, insects and light.
Position the antenna. Keep the external antenna outside the tank, upright and away from metal covers where possible.
Pair it with the app. Power on the sensor (and the screen on RF models), install Tuya Smart or Smart Life, hold the reset button for about 5 seconds until the indicator flashes rapidly, turn on Wi-Fi and Bluetooth on your phone, tap Add Device and follow the on-screen steps on your 2.4 GHz network.
Set up and test. Enter the tank depth and alert levels as the device's instructions describe, then compare the first reading with a stick measurement.

Work on the roof only in dry, calm weather, and keep away from unprotected edges.

Tips for reliable readings

Check the sensor face now and then for dust, insects or webs.
If the reading jumps while the tank fills, move the sensor further from the inlet.
If a Wi-Fi sensor keeps going offline, improve roof coverage or switch to an RF model.
A full-tank alert tells you when the float valve fails, but it does not fix it.

Frequently asked questions

What is the easiest way to know how much water is in my tank?

Measure the water height with a clean stick and convert it to liters, or fit a water level sensor that shows the level on your phone or an indoor screen.

How do I calculate the liters in my water tank?

Upright round tank: 3.14 × radius × radius × water height × 1,000. Rectangular tank: length × width × water height × 1,000. Use meters for all measurements.

How does a water level sensor for tanks work?

An ultrasonic sensor on the lid sends a sound pulse down to the water and times the echo, which gives the distance to the surface and therefore the water level.

Do I need Wi-Fi on the roof for a tank level meter?

For a Wi-Fi sensor such as the EPTech.WiFi.Plus, yes. The RF models only need Wi-Fi inside the home, because the sensor talks to the indoor screen by radio.

What is the difference between a float valve and a water level sensor?

A float valve closes the inlet when the tank is full; a float switch works a pump at a set level. Neither shows how much water is left, while a level sensor gives a continuous reading.