🔥 Why choose an electrode boiler?
No chimney or exhaust system required
Compact — fits even in small utility spaces
Clean and odor-free
— no soot, no ash
Great for homes, garages,
workshops, car washes
Works perfectly with regular tap water
(up to 200 μS/cm conductivity) — no need for expensive fluids or additives
Ideal for use with solar panels
🔥 How to choose an electrode boiler and not make a mistake?
⚙️ An electric boiler is the heart of your heating system.
But how do you know which one is right for your home, flat or business?
⚡ Single phase or three phase?
📏 What capacity?
🎛️ What kind of control is it with?
💧 What does it work with - underfloor heating, radiators, solar panels?
This guide will help you understand everything step-by-step, with examples, diagrams and hints.
No confusion - just clear answers and straightforward advice.
🔌 Step One: What type of electrical connection do you have at home?
To choose the right electrode boiler, first determine what kind of power supply your home has.
What is the voltage in your home❓
230V
400V
🧩 All boiler models by voltage and power range
Before choosing a boiler model, it's useful to estimate how much heating power your space needs.
🏠 As a general rule: one kilowatt (1 kW) of boiler power covers about fifteen square meters (15 m²) of moderately insulated space, which is typically sufficient for most European climates.
📏 Example:
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45 m² → approx. 3 kW
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90 m² → approx. 6 kW
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150 m² → approx. 10 kW
This helps match the boiler’s power to your actual heating needs
You can now use the chart below to find the right boiler based on your available voltage and estimated power.
The diagram below shows all available GAZDA and GALAN boiler models categorized by power supply.
➖ Dotted lines represent boilers that, while designed for three-phase connection, can also be used with single-phase setups — typically up to 9 kW.
Technically, any three-phase electrode boiler can be connected to a 230 V supply. However, in practice this is only done with models up to 9 kW, because higher-power units often exceed the limits of single-phase electrical infrastructure.
And by the way, flexibility works both ways. Just like you can connect some three-phase boilers to a single-phase system (up to 9 kW), you can also connect three single-phase boilers to a three-phase network. This allows you to distribute the load evenly across all phases — no need to boost the neutral wire. Since the phases never hit peak load at the same time. This setup is often used in cascade or parallel hydraulic connections.
🎛️ Step Two: What kind of control do you prefer?
Standard controller
water temperature
Programmable controller
water temperature
Standard controller
air temperature
Programmable controller
air temperature
Standard controller – water temperature
🔧 Adjusts heating based on water temperature in the heating system.
✅ Turns the boiler on and off based on the user-set temperature of the heating fluid.
📦 Example product on our website:
The comfort and efficiency of your heating system depend on the type of thermostat you use. Here are the main options.
🧊 Basic controllers (non-Wi-Fi):
💬 We used to install those TP-16 controllers — but you know what? We completely switched to the GAZDA G105. And here's why — it’s just got way more pros.
First — it has one simple heating mode. None of that "cooling" mode or “intrval” mode. Honestly, that makes a huge difference! Second — you can easily connect an air thermostat to the G105, and it just works. No issues.
With the TP-16, we were constantly getting calls: “It’s not heating”, “It’s broken”, seriously... And turns out, the person just accidentally switched it to cooling mode or “window” mode, and the boiler wouldn’t turn on. So there we were, explaining over the phone for half an hour how to switch it back. It got old real quick.
So yeah — we moved to the GAZDA G105, and guess what? It’s been ages, and not a single call like that. It’s simple, clear, works like it should. Everyone’s happier — us and the clients!
Programmable controller – water temperature
📅 Lets you schedule heating during the day or week based on water temperature.
✅ Good for homes with predictable routines.
📦 Example product:
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💬 I wanted to say a few words about the TP16H too. This is our weekly thermostat, unlike the standard one. I still keep these around, even have a couple lying in storage.
What can I say - it's basically a decent regulator, works as it should. Controls water temperature without any special complications. There are tons of similar models on the market now, nothing extraordinary, but it's a reliable piece of equipment.
We worked with it for a long time without any significant issues. The most important thing - you can program it for a whole week ahead, which some customers really appreciate.
By the way, we even put together a tutorial for it - both video and proper instructions. If you follow the link I posted just above, you'll see everything for yourself. It shows all the details: how to set it up and how to program it. Nothing complicated, really, you just need to figure it out once.
In short, it's a standard thermostat, nothing fancy, but it gets the job done. If you need weekly programming - this is just the thing!
💬 About KROS 110 and KROS 325 thermostats:
Let me tell you something else — KROS 110 and KROS 325 thermostats are something special. Technically, they fall under the “programmable water temperature” category, but in reality — they’re on a whole different level.
Their main feature isn’t just scheduling — it’s that they actually control the power level of the electrode boiler itself. That’s super rare when we talk about thermostats for boilers! You manually set how much power the boiler should run at — which lets you adapt the system to any kind of water. Too much mineral content? Just reduce the power — and everything runs smooth.
Yes, of course, they can also run on a schedule — day, night, weekends, whatever you need. But the real value is in that fine-tuned control, not just basic on/off switching.
If you’ve got an electrode boiler — these thermostats are a perfect match.
Oh, and don’t forget the single-phase GAZDA GM 106 boiler. It already has a built-in controller based on the KROS system — so it comes ready with integrated power control. Basically, it’s a monoblock: boiler and controller in one compact unit. Super convenient, especially if you want minimal wiring and maximum efficiency.
Standard controller – air temperature
🌡️ Measures and controls temperature in the room.
✅ Maintains room temperature based on the value set by the user.
📦 Example product:
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💬 Let me tell ya about those bimetallic air thermostats real quick. These are like the simplest regulators you'll find - total basics!
So how they work - you just set your air temp, and inside there's these two metal plates made of different metals. When they heat up, they either connect or disconnect from each other, and that's the whole principle behind it. That's where the name "bimetallic" comes from, obviously.
Let's say you set it to 22°C, and it's got about a 1°C differential by default. So what happens? It'll switch off at 22° and then kick back on when it drops to 21°. Super simple stuff!
To be honest, we hardly ever used these ourselves. But hey, if someone needs a dead-simple solution that just works without any bells and whistles, they're perfectly fine. Nothing fancy, just old-school reliable tech that's been around forever.
Cheap too, compared to all those digital models. Sometimes you just don't need all those extra features, you know? Just something that turns your heat on and off without having to think about it!
Programmable controller – air temperature
📆 Full scheduling by air temperature in the room.
✅ Great for switching between day/night comfort levels.
📦 Example product:
Computherm Q7
💬 So the next one we've got is the Computherm Q7 thermostat. It's basically just a regular air temperature regulator that runs on two batteries, I think. It was manufactured in Hungary for many years, and we used it too - installed it in parallel with the TP16 water thermostat and with others as well.
Can't really say anything bad about this one either. Just a standard regulator with a nice big LCD display, which is actually pretty pleasant to use. Again, there are countless regulators like this around the world, especially with China pumping them out like nobody's business.
We found it reliable enough for everyday use. The large display makes it easy for customers to read the settings, which is always a plus, especially for older folks. Nothing fancy about it - just does what it's supposed to do without any fuss.
So yeah, pretty basic stuff, but sometimes that's exactly what you need - something straightforward that just works!
📡 Wi-Fi controllers
Both air-based and water-based Wi-Fi thermostats can be integrated into a smart home system — no difference in functionality here. The only distinction is how they measure temperature:
Wi-Fi thermostat – air temperature
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🌬️ Measures and regulates the temperature inside your room. This is the classic approach — controlling comfort based on what you feel.
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Wi-Fi thermostat – water temperature
💧 Measures and regulates the temperature of the heating fluid inside your system. Indirectly affects room temperature, but gives precise control over boiler operation.
📲 Both types work via mobile apps, offer scheduling and remote control, and are fully compatible with all GAZDA and GALAN boilers — especially effective when used with solar panels or smart energy setups.
Wi-Fi thermostat – air temperature
🌬️ Measures and regulates the temperature inside your room — the classic and most intuitive way to control comfort.
🧰 Example: These are typical Wi-Fi thermostats that regulate air temperature. The market is full of such models, so this is just one example.
💬 Back in 2022 — especially before autumn — we actively installed Wi-Fi thermostats that controlled the boiler based on air temperature in the room. At the time, it was a real trend — even older generations were getting interested in managing their heating from a smartphone, setting schedules, checking temperatures, and so on.
We’ve added a few models to our site just as examples — ones we actually used. These days, we no longer install or recommend these thermostats, but for reference, that’s what we were working with back then.
We picked a couple of options that seemed reliable and easy to use — they’re shown in the photos below. We installed them more than once, and they did their job.
That said, no system is perfect. These thermostats come with their quirks. First — accuracy. They only respond to the air temperature in the room where they’re installed, not the whole house. So one room might be warm, another too cold — it’s not always ideal.
Second — connectivity. These systems have two parts: a base unit and a display unit. They communicate over radio, and that signal can get spotty, especially with thick walls. There are versions with wired connections between base and display, but that means running cables — not always convenient.
That’s why, in some cases, we installed them together with a water-based thermostat, in a sequential setup. The water thermostat is set to 70 °C to prevent overheating, while the Wi-Fi air unit manages comfort — say, to keep the room at 22 °C. The result is a safer and more precise control system.
Wi-Fi thermostat – water temperature
💧 Measures and regulates the temperature of the heating fluid inside your system. These thermostats allow for more precise boiler control, since they directly reflect and manage the actual temperature of the heating medium — not just the surrounding air.
🧰 Example: Konlen Wi-Fi controllers give you full control over system behavior, especially useful when tuning for managing boiler performance more accurately.
💬 About Konlen thermostats (orange KL-WF-96D and blue KL-T-2T):
When the Konlen KL-WF-96D (the orange one) first appeared, I literally jumped out of my chair. Finally! I bought it right away on AliExpress, made a video guide, and posted it on the site. People really appreciated it — clear, convenient, Wi-Fi-controlled, and working based on heating fluid temperature.
But as usual with the Chinese manufacturers — it was almost perfect. The biggest drawback of the KL-WF-96D was its size. It technically mounts on a DIN rail, but it didn't fit into standard plastic enclosures — too tall and not deep enough. I had to trim the plastic, adjust mounts, add bolts — anyone who’s dealt with it will understand. On the Konlen thermostat page, there’s still a section at the bottom with all the tricky installation details for the orange KL-WF-96D. That info will come in handy if you decide to go with that model.
Then in January 2024, the KL-T-2T — the blue Konlen — came out, and honestly, I fell in love. The mounting is perfect: two DIN modules, fits like a glove. The app interface got better, the old schedule bugs disappeared, and everything just works as it should.
And the precision — 0.1 °C. By comparison, the older KL-WF-96D had 0.5 °C. Maybe that level of accuracy is overkill for water, but it actually made me think: why not try using it for air temperature as well? I mentioned this in the video I made for it. I haven’t tested it that way yet, but honestly — with that kind of accuracy, it could work really well in that role too.
💡 And what makes any Wi-Fi thermostat truly powerful — air or water-based — is its ability to integrate into a smart ecosystem. Platforms like Tuya or Smart Life let you connect and control multiple devices from one app. If you already use one of these platforms, you can easily add a Konlen Wi-Fi thermostat to your existing setup — no need to create a new ecosystem.
You can start with something simple — like our boiler paired with a Konlen Wi-Fi thermostat — and later expand your system with:
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smart floor heating controls,
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solar panel management,
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or other Wi-Fi-enabled smart devices.
This creates a unified smart home experience, where heating, energy, and comfort all work together automatically.