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Secure (Horstmann) HRT4-B Digital Thermostat
£35.76
Ex VAT: £29.80
Horstmann are now known as Secure Controls
HRT4B Digital Thermostat with TPI
Replaces obsolete DRT1
- TPI energy saving software (adjustable for Gas Oil and Electric systems)
- Backlit Display
- For use with a new installation or as a replacement
- 3(1) amp volt free change over contacts
- Ideal for use with combi boilers
- Temperature ange 5-30°C
- Dimensions: 86x86x36.25mm HxWxD
Please Note: When replacing a traditional thermostat with a digital thermostat it is important that any neutral wire is safely isolated and NOT connected the the digital thermostat.
Ask a Question about Secure (Horstmann) HRT4-B Digital Thermostat
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Yes, the HRT4 would be suitable.
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Yes, if the model number is the same, then it will be like-for-like.
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Black needs to go to terminal 4, not 3.
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It sounds like the TPI function. However seconds does sound very short.
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It means the batteries are very low and should be changed immediately.
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Hi. Yes, as long as it controlling a gas or oil boiler. You will need to isolate the neutral wire as it will not be needed by the HRT4-B.
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Yes it will.
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No, the HRT4-B doesn't have any wireless chips in it.
The HRT4-ZW is the one with Z-Wave communication.
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No. The HRT4-B is not wireless.
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Yes. You will need to isolate the neutral as it is not needed by the digital thermostat.
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The batteries go into the back of the thermostat. Make sure you switch off the electric before removing the thermostat from its backplate. It uses 2 x normal AAA batteries.
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No. The HRT4-ZW is wireless, but the HRT4-B is wired.
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Yes it can. It will plug directly onto the existing backplate for a simple swap.
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Yes a symbol will appear on the screen when the batteries are low.