If set temperature to 21 all night in my room, will the valve make noise, turning on and off to keep temperature?how many times rectify temp in a nigh

Yes, but it isn't very loud. I'm a light sleeper and it's never woke me. How often will depend on the weather, it will keep opening and closing to keep at 21 degrees. There is a setting on the mail controller that allow it to be a number of degrees off the required temp before activating which my help reduce that for you.

Will these work with a steam heating system in the United States?

If they will fit the US thermostatic valves and the controller is the correct voltage and the steam is available at all times ...... it should work!

Does this work with the Amazon Echo?

Not directly. You need to pair this to the Evohome controller. The Evohome controller is what connects to you boiler via the relay box. Then the Evohome controller connects to this TRV and controls it via a proprietary wireless signal. It’s not WIFI. The Evohome controller is wifi so you connect that to your home network and you will then have App control. Once you have that set up the Alexa integration can be set up. That will then give you the control you want.

Do the radiator valves connect to the main house wifi, or do they use a proprietary wifi provided by the controller?

As stated they use a different frequency from wifi and do not have any interface to your network directly. They interface with the Evohome thermostat which then interfaces with your wifi and from there to the Honeywell evohome app and Amazon Echos (maybe Google, etc but I can only comment on Alexa as that’s all I have.)

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Description

🔥 Take control of your comfort—one smart radiator at a time! 🎯

LONG LASTING POWER - Two-year battery life with low-battery alerts keeps your system running worry-free.
ENERGY SAVING MODES - Eco, holiday, and day-off settings optimize comfort and reduce bills 24/7.
SMART ZONING MASTERY - Control up to 12 zones with evohome for personalized comfort in every room.
EFFORTLESS INSTALLATION - Fits most UK radiator valves with included adaptors—no system drain needed.
INTUITIVE DIGITAL DISPLAY - Backlit LCD with easy-to-read zone names and quick temperature overrides.

The Honeywell Home THR92H1002 evohome Wireless Radiator Controller Head is a sleek, UK-specific smart radiator valve that integrates with the evohome Wi-Fi thermostat system. It offers precise temperature control in half-degree increments, supports multi-zone heating setups, and features a clear backlit LCD display. Designed for easy installation on most radiator valves without draining your system, it boasts a robust polycarbonate build and a two-year battery life with low-battery alerts. Perfect for professionals seeking efficient, customizable home heating with seamless smartphone and voice assistant integration.

Specifications

ASIN	B00P12BJNO
Batteries	2 AA batteries required. (included)
Batteries Required?	Yes
Batteries included?	Yes
Battery Cell Type	NiMH
Best Sellers Rank	22,895 in DIY & Tools ( See Top 100 in DIY & Tools ) 158 in Central Heating System Accessories
Customer Reviews	4.5 4.5 out of 5 stars (204)
Date First Available	18 Oct. 2014
Delivery information	We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout.
Item Package Quantity	1
Item Weight	300 g
Item model number	THR92H1002
Manufacturer	Honeywell
Part Number	THR92H1002
Plug profile	Wall Mount
Power Source	Battery Powered
Product Dimensions	7.6 x 10.4 x 21.6 cm; 300 g
Special Features	Programmable
Style	Radiator Controller
Voltage	12 Volts

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25201 som

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Honeywell Home THR92H1002 evohome Wireless Radiator Controller Head for UK, White

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