LILIE Frostwächter water tank heater 12 V 30 W with thermostat - frost protection for over 40 l of water
- LILIE Frostwächter 12 V 30 W stainless steel heater for fresh and grey water tanks. Switches on at approx. 5°C, off at approx. 10°C and protects over 40 l of water from freezing.
LILIE Frostwächter is an electric 12 V heater fitted in a fresh or grey water tank. When the water cools to approx. 5°C, the built-in thermostat switches heating on, and at approx. 10°C the heater switches itself off. According to LILIE it protects over 40 l of water from freezing.

Key information
- 12 V, 30 W while heating
- thermostat: on approx. 5°C, off approx. 10°C
- stainless steel, brass nut with seal
- dry-running and overheat protection
- reverse polarity protection
- 26 mm mounting hole
Before you order
The heater is fitted in a 26 mm hole in the tank wall and connected via two flat connectors + and -. LILIE points out that the mounting position must be protected so that the contacts stay clear of dirt, salt, rain and splash water. LILIE recommends connecting the heater via a switch and switching it off when the battery will not be charged for a longer time. Before ordering, check the system voltage and the mounting position in your vehicle.
Related products
- LILIE Frostwächter heater 24 V 30 W
- LILIE Ultraheat tank heater 55 W up to 110 l
- LILIE Ultraheat tank heater 38 W up to 80 l
Technical data
| Parameter | Value |
|---|---|
| Manufacturer | LILIE |
| Voltage | 12 V |
| Power | 30 W while heating |
| Thermostat | on approx. 5°C / off approx. 10°C |
| Protection | over 40 l of water |
| Dimensions | length 200 mm, ø 18 mm |
| Mounting hole | ø 26 mm |
| Thread length | 16 mm |
| Material | stainless steel |
| LILIE article number | 24230 |
Questions and answers
When does the heater switch on?
At a water temperature of approx. 5°C, it switches off at approx. 10°C.
How much water does it protect?
According to LILIE over 40 l.
What hole is needed?
A 26 mm hole in the tank wall.
Can it run dry?
Yes, it has a thermostat with dry-running and overheat protection.
Manufacturer
LILIE GmbH & Co. KG, Heinrich-Hertz-Straße 30, 74354 Besigheim, Germany.





