Self-regulating heated drains and through wall parapet drains

Self-regulating electric heating of drains and through wall parapet drains ensures reliable drainage in winter season. It functions in principle of resistance change between semiconductors in dependence on ambient temperature. Laically said, the lower temperature in drain surroundings, the higher output the heating has. The highest risk of drains or through wall parapet drains blocking is with temperatures around 32°F, when so called ice plug of hoar-frost and snow may block drains or even whole piping. Heating is designed to protect not only a mouth of the roof drain but its immediate surroundings as well.

Self-regulating heating

Advantages of self-regulating heating

Reliable drainage also in winter season
Voltage 110 V / 60 Hz – without necessity of a transformer or a control unit
Option of connection to heating of through wall parapet drains, downpipes, garage entries etc.
Simple connection via a switch or a thermostat
Electric energy saving

Heating connection and regulation

The self-regulating heating system increases its output according to the ambient temperature but in summer months it has a minimum electric input. Therefore we recommend to switch off the electricity supply when temperatures exceed +37°F. We recommend setting the thermostats to +37°F and placing the temperature sensor to the northern side or to another side without external influences.

Basic options of connecting of heated drains

Without possibility of switching off (energy consumption also in summer season – not recommended)
Mechanical switch (manipulation required), or time socket
Outer thermostat with integrated thermal sensor
Thermostat to a switchboard including thermal sensor for measuring of outer temperature
Thermostat to a switchboard including thermal and humidity sensor

Connection description

Connection is performed in an electric box under roof structure
Length of the drain supply cable is 5´. Cable wire NM-B 14-2
Wire connection: brown – guard, black – phase, white - neutral
AC voltage: 110 V, 60 Hz
Enclosure rating: IP 67

Roof drains (TWE):

Input power: variable according to the ambient temperature, approx: 10 W at 68°F / 14 W at 32°F / 20 W at -4°F
Max. current surge: 120mA

Retro drains and extended single-wall roof drains (TWE RETRO):

Input power: variable accordingto the ambient temperature, approx: 10 W at 68°F / 14 W at 32°F / 20 W at -4°F
Max. current surge: 120 mA

Balcony drains and through wall parapet drains (TWBE, TWCE):

Input power: variable according to the ambient temperature, approx: 10 W at 68°F / 14 W at 32°F / 20 W at -4°F
Max. current surge: 120 mA

1 – main switch
2 – current protection
3 – circuit breaker
4 – thermostat or switch
5 – drain
L – phase (black)
N – neutral (white)
PE – guard (brown)