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GSM/SMS Central Heating Control

Energy efficient
Only heat your home when you need it. Keep complete control over your energy bills.

Have a holiday home?
Have your holiday home snug and warm for your arrival.

Going for a meal after work?
Turn it off, turn it back on again when you're on your way home.

Match your schedule
Coming home early or working late at the office? Make your heating fit with your variable schedule.

Looking after elderly parents? Operate their home's central heating for your own peace of mind.

Improve security
It’s not just heating you can control, improve security by operating other appliances whilst you’re not at home.

Quick Start Guide


Jump to the Specifications.

The SMS Central Heating unit is a universal GSM dialer and controller. It provides 2 power relays and 4 input terminals.

The SMS Central Heating unit provides:

  • 2 output contacts of power relays X and Y (each allows up to 5A/250V)
  • 4 input terminals A to D for SMS reporting (the inputs react to a connection or disconnection to or from a common GND terminal)

The SMS Central Heating unit can be used as:

  • A switch with SMS remote control. SMS texts for switching particular terminals on/off are configurable.
  • A time-switch which can be activated remotely via a mobile phone (the switch-on period is configurable from 1 second to 10 hours).
  • A relay with dialling-in remote control. Up to 50 tel. numbers can be authorized for each relay. Because calls are not answered dialling-in control within GSM is free of charge. (David only checks the caller’s number and - if the number is authorized - responds with relay activation.) This can be used for parking latch control etc.
  • A relay with validity-limited dialling-in remote control. Each authorized number can have a limit to the number of calls. When the call count reaches the limit the tel. number is de-authorized. This can be useful for pre-paid services such as e.g. parking. Any tel. number can be re-authorized via SMS by the administrator.
  • An SMS reporter. Input A to D activations or deactivations can be reported by SMS and optionally confirmed by phone calls. Each input can have its own message texts and up to 8 tel. numbers programmed.


Power supply 11 - 13 V DC
Stand-by consumption approx 20 mA
Max. consumption (during communication) 500 mA
GSM band E-GSM 850 / 900 / 1800 / 1900 MHz
RF output power 2 W for GSM 850 / 900, 1 W for GSM 1800 / 1900
A, B, C and D input terminals activated by a connection to GND
X1+X2 and Y1+Y2 output terminals 2x NO contacts fused to max. 5 A / 250 V
Can be operated according to VO-R/1/07.2005-14
Safety EN 60950-1
EMC EN 301489-7, EN 55022 and EN 50130-4
Radio transmissions ETSI EN 301419-1 and EN 301511
Environment II. indoor general (-10°C to +40°C)
Dimensions (without antenna) 76 x 110 x 33 mm
GSM antenna connected to SMA connector