Is this Worcester Bosch Thermostat a suitable replacement for a Honeywell ST9400C?

[EssexAndy]

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I have given up on the Honeywell thermostat which like the previous 2 or 3 has developed a mind of it's own. I have followed the Technical Departments instructions to wire in capactitors across various terminals & the suggestions from others who have suffered the same problem.

The unit I am considering is this one:

WORCESTER BOSCH 7733600001 COMFORT I WIRELESS ROOM THERMOSTAT PLUG-IN PROGRAM

Greenstar Comfort I Professional | Worcester Bosch

Discover Greenstar Comfort I: an intelligent, wireless programmer with a thermostat. It provides a 3% ErP efficiency boost when fitted with a gas boiler.

www.worcester-bosch.co.uk

I did message the retailer this question but I didn't get a response.

Or is there a thermostat (other than a Honeywell) that is tried & trusted?

Thanks very much!

 

[stem]

Well the Honeywell ST9400C is a dual programmer that has hot water and central heating control in it. They are designed to control heat only or system boilers with central heating and a separate hot water cylinder.

The Wireless thermostat you refer to will control central heating only and will only fit certain models of Worcester combi boilers that don't have a separate hot water system. (hot water cylinder).

So, based on the above the answer is no.

To replace a Honeywell ST9400C which is dual channel you would need a dual channel thermostat, such as Nest 3rd Gen / Hive Dual Channel / Tado Smart Thermostat with Hot Water control / Wiser 2 Channel etc.,

However, some information describing your heating & hot water system would allow confirmation, which may be why you didn't get a response to your earlier post.

 

[EssexAndy]

Thanks very much, that's really helpful.
My system has a hot water cylinder with a motorised 3-way valve.
I will have a look at the thermostats you have suggested.