Electric Water Heater Thermometer

🔎 What is the Temperature Indicator?

The temperature indicator is a mechanical dial gauge used in electric water heaters to show the approximate water temperature inside the tank.

👉 It is only for indication
👉 It does not control heating (thermostat does)

⚙️ Working Principle

• Uses bimetal strip / coil

• Expands with temperature

• Moves internal mechanism

• Rotates the pointer

✔ No eleelectricity
✔ Simple & reliable

 Main Components

1 — Transparent Cover
A clear protective cover that allows visibility of the pointer.
Typically made from polycarbonate (PC) for durability and impact resistance.

2 — Pointer (Needle)
Moves across the dial to indicate the current temperature reading.

3 — Dial Face Label (°C)
Displays the temperature scale in degrees Celsius.
Includes visual zones for quick indication: Cold / Normal / Hot.

4 — Housing
Outer body made of plastic or metal.
Designed for secure snap-in mounting.

5 — Bimetal Sensor
Responds to temperature changes and converts heat into mechanical motion to drive the pointer.

6 — Spring
Applies continuous force to keep the contact cap firmly pressed against the hot surface.

7 — Contact Cap
Made of aluminum or copper.
Ensures efficient heat transfer between the thermometer and the measured surface.

 Typical Specifications

Parameter Value

Temperature Range 0 – 100°C

Accuracy ±2–5°C

Display Analog dial

Mounting Type Snap-in / sheet cutout

Power Not required

 Sheet cutout Specifications

Installation Method (Special cutout )

Mounting Concept

The thermometer is installed using a special keyhole-shaped slot in the heater outer casing.

✔ Why this design?

• Fast assembly (no screws)

• Low cost

• Easy replacement

• Secure locking

Installation Notes

• Ensure correct orientation

• Avoid forcing (prevents plastic damage)

• Check tight fit (no vibration)

• Ensure good thermal contact with tank surface

👉 Available in the engineering resourses 2D&3D dowinlods

🔗 Related Pages

• • thermostat-water-heater

  • heating-element-specifications

  • electric-water-heater-tank-design

  • download the 2d and 3d specifications

🔗 Related Resources

• Tank Design — Design principles

• Dome (Head ) Design — Design principle

•  Wall Thickness — Thickness design

•  Insulation — Thermal protection

• Water Heater Basics — Components & operation

• Calculatores needed to design the elecreic water heater