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Express delivery for Wednesday Available Until 4pm Tomorrow
UK Mainland Only,
3pm cut-off for Highlands and Islands
12 noon for Europe


 

Express delivery for Wednesday Available Until 4pm Tomorrow
UK Mainland Only,
3pm cut-off for Highlands and Islands
12 noon for Europe


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Siemens RDH100 Digital Thermostat

Brand: Siemens (Landis & Staefa/Gyr)
HCO Code: 16C19
Price: £28.61
Ex VAT: £23.84
Stock: In Stock
Qty:  
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Q: Does the RDH100 employ silent (i.e. Triac) switching? I am retrofitting to a two wire installation so need ones like this that are battery powered.

A: No, Triac switching is normally only found on underfloor heating thermostats - as they are unsuitable for switching a pump directly. I do not know of any 2-wire underfloor heating thermostats. A wireless thermostat may be your best option if noise is an issue.
Q: We have a standard older Drayton 33-10B... analogue wall mounted room-stat driving our central heating valve. It has four terminals; Common, Demand, Satisfied and Neutral. Can the Siemens RDH100 Digital Thermostat be used as an upgrade replacement, without changing any wiring please?

A: Yes, the neutral will not be needed so should be isolated.
Q: will this work with my old two wire thermostat that has not have 230v going to it

A: Yes it will.
Q: Will this replace my ancient Honeywell T40 room stat Which has three wires - Live, Live out, neutral? I suspect the neutral will just be redundant?

A: Yes, as long as it is controlling a gas or oil boiler. The neutral is not needed so should be isolated.

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New!

Replaces RDH10

Large LCD display

  • Set point 5-30C
  • 5(2)A volt-free contacts
  • Dimensions 120x90x26.9 mm HxWxD
  • Battery Powered (2 x AA)

The digital display shows the actual room temperature and the comfort temperature setpoint.
When the heating output is active, the triangle symbol appears.

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Heating Controls Online is rated 4.90 stars by Reviews.co.uk based on 2464 merchant reviews

4.90 / 5 Rating
2464 Reviews
I got this heating controller to replace the old one of the same make but updated it is as good if not better than the old one . I did try a digital one which was rubbish.
Easy to order. Delivery good
Good value for money, quick and efficient