- 1 Year Warranty
- Nominated Delivery
- Express Delivery
- 14 Day Returns
- Delivered By UPS
Horstmann S21 2 Channel 24 Hour Programmer
The ServicePlus range of programmers and timeswitches are designed to carry out a full or partial boiler shutdown once the servicing date has become overdue.
The S21 programmer has industry standard wiring connections, making it an ideal replacement for many existing programmers.
- 2 Channel
- 24 hour
- 28 Day Service Warning
- Part L Compliant
- 3 Amp rated
- Three ON and OFF periods each day
- Hot water boost and central heating advance
- Mains powered with battery back-up
- Programme options On 24hrs, OFF, All Day or Auto
Image shows the S17 version.