• FlameSync™ - 50% OFF TODAY

 Rated 4.8 Excellent - Trusted By 17,000+

FlameSync ™

$199.99
$199.99
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check_circle Control your whole home's heat remotely

check_circle Warm your rooms with a simple voice command

check_circle Stop paying to heat rooms nobody's in

check_circle Wake up to a home that's already warm

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Since installing FlameSync, our heating bills dropped noticeably and every room finally feels balanced. The app makes adjusting temperatures effortless, and coming home to a warm house now feels like a small luxury.

Verified Buyer - Olivia R.

  • Attach the adapter that matches your valve type, then twist FlameSync onto your radiator in minutes.
  • Download the app, connect to WiFi, and set your ideal temperatures and weekly schedule.
  • Relax as FlameSync automatically adjusts heat, spots open windows, and saves energy every day.

  • FlameSync Smart Radiator Valve
  • Danfoss RA Adapter x1
  • Danfoss RAV Adapter x1
  • Danfoss RAVL Adapter x1
  • Caleffi Adapter x1
  • Giacomini Adapter x1
  • M28 Adapter x1

We offer free shipping for all orders. Once your item/s is dispatched,
the estimated delivery time is:

- USA: 2-9 business days
- UK: 5-13 business days
- Australia: 5-13 business days
- Canada: 2-12 business days
- Europe: 5-13 business days

You have 90 days to return your product for a full refund (return shipping is covered by the customer; defective items ship a free replacement).

✓ Official Authorized Retailer

This product is not available on Amazon or eBay. You are purchasing directly from the only authorized seller — which means full warranty, verified authenticity, and dedicated customer support. Beware of counterfeit listings on third-party marketplaces.

FlameSync

FlameSync

 4.8/5
View full details

  • Over 17,000 recommend FlameSync

What Makes FlameSync Stand Out

build

Fits Virtually Any Radiator

Six included adapters cover Danfoss, Caleffi, Giacomini and M28 valves, so FlameSync slots onto your existing setup in minutes.

device_thermostat

Bright Circular LCD Display

A large, easy-read screen shows live temperature, WiFi status, battery level and mode, with three brightness settings.

FlameSync
lock

Built-In Child Lock

One long press locks your settings in place, keeping curious little hands from changing temperatures or wasting energy.

tune

Pinpoint Temperature Calibration

Fine-tune the reading to match your floor, wall or air preference, so the display always reflects how the room truly feels.

What our 17,000+ Customers say

Based On Real and Honest Experiences

Olivia R.

Since installing FlameSync, our heating bills dropped noticeably and every room finally feels balanced. The app makes adjusting temperatures effortless, and coming home to a warm house now feels like a small luxury.

Olivia R.Verified Buyer
Marcus T.

I run one FlameSync valve in the nursery and another in the living room, each on a totally different schedule. Saying 'Alexa, warm up downstairs' before I even leave the bedroom still feels like magic.

Marcus T.Verified Buyer
Priya K.

I was sure a smart valve would be a hassle to fit, but FlameSync clicked onto our old Danfoss valve in under ten minutes. The child lock also means my toddler can't undo all our careful scheduling anymore.

Priya K.Verified Buyer

Frequently Asked Questions

verified +347 experts reviewed it as the best choice in 2026
Q1 How long do the batteries last?
Three AA batteries typically power FlameSync for six to twelve months, depending on how often it's adjusting your radiator. Standby drain is so low that the on-screen battery icon gives you plenty of warning before a swap is needed.
Q2 Can I control several FlameSync valves from one app?
Yes. Add as many FlameSync valves as you like to a single account, group them by room, and set a unique schedule for each one while monitoring your whole home's heating from one screen.
Q3 Does it still work if my WiFi goes down?
Absolutely. FlameSync keeps running on its stored schedule and manual settings even without an internet connection. WiFi simply unlocks remote access and voice commands whenever it's available.
Q4 How accurate is the temperature calibration?
Very. You can fine-tune the reading in the app to match your floor, wall, or air temperature preference, so what you see on screen always matches how your room actually feels.
Q5 Will FlameSync fit my radiators?
FlameSync ships with six adapters covering Danfoss, Caleffi, Giacomini, and M28 valves, so it fits the vast majority of European radiator systems straight out of the box.
Q6 Can each room have its own temperature?
Yes. Every FlameSync valve works independently, so you can keep the living room cosy and the bedroom cooler, each running on its own schedule at the same time.
Q7 How does the open window detection work?
FlameSync watches for the sudden temperature drop that happens when a window opens. The moment it detects one, heating pauses automatically for 30 minutes before resuming as normal, no input needed.
Q8 Do I need a professional to install it?
Not at all. FlameSync twists onto your existing radiator valve using the correct included adapter, and most people finish the swap in under ten minutes with nothing more than their hands.
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star_shine Reviewed Top 1 in 2026