BEOK CONTROLS WiFi Thermostat Review: cheap way to make an old boiler a bit smarter

I put this BEOK WiFi thermostat on a fairly standard combi boiler setup that originally had a dumb 2‑wire wall stat. I wanted something simple: keep the two wires, control the heating from my phone, and avoid running new cables or adding a mains‑powered thermostat. On paper, this one checked all the boxes: 2‑wire dry contact, works with Tuya / Smart Life, and runs on AA batteries. The price was also lower than a lot of big‑name brands.

In practice, it does mostly what it says. It turns the boiler on and off based on the temperature you set, you can control it from your phone, and it talks to Alexa/Google. If that’s all you’re after, it basically gets the job done. But it’s not perfect. You feel that it’s a budget product: the plastic, the screen, the terminals, the Wi‑Fi stability, all remind you why it’s cheaper.

After a couple of weeks, my general feeling is: it’s a pretty solid upgrade from a basic mechanical thermostat, but you need to accept some compromises. The smart functions work, but they’re not as polished as with bigger brands, and there are a few small annoyances that you only notice after using it day to day. If you’re picky about interfaces or expect flawless Wi‑Fi, this might bother you.

If you just want something cheap that lets you schedule your heating and check/change the temperature from your phone, it’s worth considering. If you’re expecting a polished, “install and forget” premium smart thermostat experience, this isn’t it. It’s more of a practical hack to modernise an old boiler without spending a fortune.

Looking at the price versus what you get, I’d say this thermostat offers good value for a specific type of user. If you already have a simple 2‑wire thermostat and just want to add Wi‑Fi control and scheduling without hiring an electrician, this is a cheap way to do it. You keep the same wiring, you don’t touch mains, and you end up with app and voice control. Compared to big brands that cost two or three times more, it’s hard to argue with the basic feature set for the money.

That said, the low price comes with clear compromises: small non‑backlit screen, basic interface, questionable Wi‑Fi stability in some cases, and higher battery consumption. If those things bother you, then the value drops quickly, because you’ll end up frustrated and maybe replacing it later with something better. In that case, you might be better off spending more upfront and getting a more polished thermostat with a mains supply and better hardware.

Where this product shines is for people who just want: on/off boiler control, phone app, simple scheduling, and Alexa/Google integration, and don’t really care about fancy design or advanced features. For them, it’s good value for money, especially if they’re already in the Tuya / Smart Life ecosystem. Just be ready to buy batteries regularly and accept the occasional app or Wi‑Fi quirk.

If you’re the kind of person who likes to set something up once and never touch it again, or you’re installing this in someone else’s home (like elderly parents) where you don’t want tech headaches, I’d say this isn’t the best value. You’ll probably save time and nerves by buying a more robust, slightly pricier thermostat. So the value really depends on your tolerance for little annoyances and how tight your budget is.

Design‑wise, this thermostat is plain and compact. It’s a small white plastic box, about 8.6 cm wide and 2.5 cm deep, rectangular, with a basic digital display. If you’re hoping for a stylish gadget that stands out on the wall, this isn’t it. It blends in, which can be a good thing if you just want it to disappear next to a light switch. The finish is very “DIY store plastic”, not premium, but it doesn’t look stupid either.

The screen is small (they list 25 mm screen size), and that’s exactly how it feels: you can read it if you’re standing in front of it, but from across the room you’re not seeing much. There’s no backlight, which is a weird choice for something you might want to check in the evening. In low light you either squint or just use your phone. Personally, I ended up using the app 90% of the time and ignored the physical screen except for quick checks.

The buttons are physical and clicky. They’re not particularly nice, but they work. You get the basic controls: temperature up/down, mode, and so on. It’s not super intuitive at first, and you’ll probably look at the manual once or twice, but after that you get the hang of it. Still, compared to more polished thermostats with touch screens or clearer icons, this feels a bit dated.

One user mentioned the back box being very slim, which I agree with. If you have thick 1.5 mm² cables and not much space in the wall, you’ll be doing a bit of cable Tetris to get everything in. The terminals themselves are on the small side. It’s installable, but it doesn’t feel like it was designed with chunky UK wiring in mind. Overall, the design is practical but clearly built to hit a low price, not to impress.

The big selling point of this thermostat is that it’s battery‑powered with 3x AA batteries, so you don’t need a mains connection at the thermostat location. For old houses or places where running new cable is a pain, that’s genuinely handy. Installation is simpler and safer if you’re not comfortable working near mains voltage. You just connect the two low‑voltage boiler wires to the dry contact, pop in the batteries, and you’re done.

The downside is that Wi‑Fi and batteries are not best friends. One Amazon review mentioned the batteries dropping to 30% in about three weeks with Wi‑Fi active. That lines up with what I felt: the thermostat is quite battery‑hungry if you use all the smart features. You do get a low‑battery warning when it goes under 20%, which is a good safety net, but it still means you’ll be changing batteries more often than you’d like, especially in winter when you’re checking and tweaking more.

I used decent alkaline AA batteries, not cheap ones, and I could already see the battery indicator moving down faster than I expected. This isn’t a device you can forget about for a year. If you install it in a rental or a second home, you need to be ready to swap batteries fairly regularly, or at least keep some spares nearby. The Wi‑Fi radio just eats power; there’s no miracle here.

So, from a battery perspective, it’s a trade‑off: easy installation, no mains wiring, but more maintenance. If you hate the idea of climbing on a chair every couple of months to change batteries, you might prefer a mains‑powered Wi‑Fi thermostat instead. If you’re okay with the occasional battery change in exchange for a simpler install, this one is fine, just don’t expect it to sip power like a simple non‑connected stat.

On durability, I’ll be honest: this doesn’t feel like a product built to last 15 years, but it also doesn’t feel like total junk. The plastic casing is light and a bit cheap to the touch, but there’s no obvious flex or creaking once it’s mounted on the wall. The buttons don’t wobble and the screen hasn’t shown any weird fading or dead segments so far. For a low‑cost thermostat made in China, it’s pretty much what you’d expect.

Where I’m a bit more cautious is the Wi‑Fi module and electronics. The reports of Wi‑Fi dropouts and lockups that need a factory reset don’t scream long‑term reliability. That kind of behaviour often points to slightly flaky firmware or components that don’t handle marginal Wi‑Fi conditions very well. If you install this in a house with solid, stable Wi‑Fi, it may chug along for years. In a noisy or weak signal environment, you might see more glitches over time.

The terminals on the back are small and not super robust. They’re okay for a couple of connections, but I wouldn’t want to be constantly re‑wiring it. Also, the slim back box means cables are bent and squeezed a bit, which isn’t ideal if you need to take it off the wall multiple times (for example, to troubleshoot or change location). That said, once installed, you’re mostly just swapping batteries, not playing with the terminals.

Overall, I’d rate durability as acceptable for the price. It’s not something I’d put in a commercial setting or somewhere that needs rock‑solid reliability. For a normal home where you’re okay with the odd reboot or battery change, it should be fine. Just don’t expect the same long‑term robustness as a more expensive, brand‑name thermostat with better build and firmware.

In terms of performance, the core job is done: it turns the boiler on and off based on the temperature you set, and it follows the programmed schedule. The temperature control feels reasonably accurate. I didn’t sit there with a lab thermometer, but room temperature matched what I expected, and there were no wild swings. The 1 °C differential is fine for everyday use; the house felt stable, not constantly cycling on and off.

The scheduling through the Tuya / Smart Life app works well enough. Up to 6 time slots per day is plenty. I had a simple setup: morning warm‑up, daytime setback, evening warm‑up, night setback. Once configured, it followed the schedule without issues. You can also override the current temp easily from the app. One small annoyance: there’s no dedicated 1‑hour boost function, which one reviewer also pointed out. If you like to keep your system always “on” and just bump the temp for a short time, you have to manually raise it and then remember to lower it again, or tweak the schedule.

Voice control via Alexa/Google works, but it depends on your Wi‑Fi stability. Commands like “set temperature to 21 degrees” and “what’s the temperature in the house?” worked for me, but there’s always a small delay. It’s convenient when you’re on the sofa or in bed and don’t want to get up. I wouldn’t buy this thermostat just for voice control, but as an extra, it’s decent.

Where performance takes a hit is Wi‑Fi reliability. Some users reported the thermostat dropping off the network and even locking up, forcing a factory reset. I had one dropout that needed re‑pairing in the app, which isn’t catastrophic but is annoying if you’re not very techy. If your router is far away or your 2.4 GHz signal is weak, expect occasional headaches. So, performance is fine on the heating side, a bit shaky on the connectivity side.

Functionally, this BEOK thermostat is pretty straightforward. It’s a battery‑powered wall thermostat with a dry contact relay, designed for 2‑wire boiler control. That means it just acts like a switch for the boiler: heating on or off, no fancy modulating stuff. It handles a temperature range of 5–35 °C, with a default 1 °C calibration and a claimed 0.5 °C accuracy. For a typical home, that’s enough. You’re not running a lab; you just want the living room to be roughly comfortable.

The smart side runs through the Tuya / Smart Life app, which is actually a plus in my book. I already had Tuya devices, so it just slotted into the same app. You can create daily schedules with up to 6 time slots per day, tweak temps remotely, and even set different 24‑hour schedules per room if you have multiple units. It also hooks into Alexa and Google Assistant, so “Alexa, set heating to 20 degrees” works as expected. Nothing fancy, but it’s usable.

On the downside, it only supports 2.4 GHz Wi‑Fi, which is normal in this price range but worth knowing if your router setup is messy. Some users report Wi‑Fi dropouts that force a reset and re‑programming. I didn’t get constant dropouts, but I did have one random disconnect that required me to re‑pair it in the app, which is annoying when you thought you’d finished setting it up.

There are no extras like a fancy backlight, humidity sensor, or big colourful screen. It’s a basic digital thermostat with remote control, not a full smart heating system. If you’re expecting features like automatic presence detection, learning algorithms, or energy reports, you won’t find them here. What you get is: set temperature, schedule, remote control, voice control. That’s it, and to be fair, for the price, that’s acceptable.