myVAILLANT App | The Complete Guide (2026)

The myVAILLANT app is designed to give you simple, powerful control over your Vaillant heat pump, wherever you are.

Paired with the myVAILLANT Connect Gateway, it helps your heat pump run efficiently, keeps your home comfortable and gives you clear insight into how your system is performing over time.

In this guide, you’ll see how the myVAILLANT app and Connect Gateway work together, how to get everything set up and which features matter most for comfort, efficiency and peace of mind.

By the end, you’ll have a clear idea of how to use the app confidently and how it can help you get the best from your Vaillant heat pump.

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Already have a Vaillant heat pump and want help with your controls? Get in touch with our team and one of our heat pump specialists will be happy to talk you through your options.

The myVAILLANT App Explained

👇 If you’d rather see the key steps in action, you can watch our video below, where we walk you through the most important features of the myVAILLANT app and show you how to set up the myVAILLANT Connect Gateway:

What the myVAILLANT App and Connect Gateway Do

The myVAILLANT Connect Gateway is the small device that connects your Vaillant system to the myVAILLANT app over the internet. It lets you:

• Control heating and hot water from your smartphone, wherever you are.
• See how efficiently your system is running over days, weeks and months.
• Get alerts if there’s an issue, like low system pressure, before the heating cuts out.
• Allow your installer (such as Glow Green) to remotely check settings and help fine‑tune performance.

In simple terms, the gateway is the bridge, and the app is your control panel.

Getting the App Set Up

After your heat pump has been installed, you’ll download the myVAILLANT app from your usual app store and create or log in to your Vaillant account.

To connect the app to your system:

1. Open the app and add a new home when prompted.
2. Have your Wi‑Fi details ready so the gateway can go online.
3. When asked, scan the QR code either:
   • On the paper that comes in the box, or
   • On the sticker on the back of the appliance.
4. Make sure the gateway or appliance light is flashing blue while you scan.
   • If it isn’t, unplug it, plug it back in, wait for it to boot up and scan when it turns to flashing blue.
   • The blue light normally lasts around 15 minutes. If it stops, just repeat the step.

Once that’s done, your system is linked and you’ll see your home appear in the app.

System Alerts and Pressure Warnings

Soon after installation, it’s common for your system to need a small top‑up of pressure. This is because:

• The system contains a lot of water and components such as volumisers and buffers.
• Tiny air bubbles ('micro bubbles') work their way out over the first days or weeks, so the pressure drops slightly.

The app will tell you if the pressure needs topping up, often with a message like 'F.22 - system needs top up'. At that point you should:

• Use the filling loop shown by your engineer to raise the pressure to about 1.5 bar.
• If the fault code stays on, press the reset button on the front of the unit.

If your system repeatedly needs topping up, that’s a sign it should be checked, and your installer, such as Glow Green, can investigate.

What You'll Find on the Home Screen

When you open the myVAILLANT app, you land on the home screen. Here, you’ll see:

• The name of your home (you can rename it to something more familiar).
• The outdoor temperature, taken from the external sensor.
• Quick Access buttons for common actions.
• Your heating zones, such as 'Zone 1' and 'Zone 2', which you can also rename (such as 'Downstairs' and 'Upstairs').

You simply tap into a zone or hot water to see more details and slide up to access controls such as temperatures and schedules.

Quick Access Buttons

Quick Access gives you three main shortcuts:

• Hot water boost - instantly heats your hot water to the set temperature. Handy if you’ve had extra showers or guests and need more hot water quickly.
• Ventilation boost - pauses heating for about 30 minutes so you can open windows and air the house without the system fighting to warm it at the same time.
• Absence mode - for holidays or trips away. This keeps the property at a safe background temperature (around 15 °C), helping to avoid frost or damp while saving energy.

These buttons mean you don’t have to dive into detailed settings every time you want to tweak something.

Energy Tab: Seeing How Efficient Your System Is

At the bottom of the app you’ll see tabs such as Home, Energy and Status.

In the Energy tab you can:

• See how much electricity your heat pump has used over a year, month, week or day.
• See how much heat energy it has produced in that time.
• Work out your system’s efficiency (its seasonal performance factor or SCOP).

For example, if you see around 2,800 kWh of electricity used and nearly 10,000 kWh of heat produced, that’s roughly a COP of 4 - meaning for every 1 kWh of electricity you pay for, you’re getting about 4 kWh of heat into your home.

This view is useful for you and your installer:

• You can understand if your system is performing well.
• Your installer, such as Glow Green, can check trends and make adjustments remotely to keep things running efficiently.

Setting Up Hot Water in the App

To set up your hot water:

1. Tap the Domestic Hot Water (DHW) section in the app.
2. Set your hot water temperature (for example, 52 °C).
3. Choose an operation mode such as 'Time controlled.'
4. If you have a hot water circulation pump (for larger homes with several bathrooms or kitchens), you can enable the circulation setting.

Weekly Hot Water Planner

You can schedule when your hot water is heated so it doesn’t clash with your heating:

A common pattern is:

• Midnight to 2:00 am: heat the cylinder ready for the morning.
• Midday to 2:00 pm: top up hot water ready for late afternoon and evening use.

Once you’ve set one day, you can copy those times to the rest of the week. Tap save to apply the schedule.

The aim is to heat water at times when you’re not relying on the system to warm the house, so it doesn’t have to split its effort.

Using Hot Water Boost

If you ever run low on hot water:

• Open the app, go to Quick Access and tap Hot water boost.
• The heat pump will focus on hot water until the cylinder is back up to temperature.

This is ideal if you have guests staying or you’ve used more hot water than usual.

Setting Up Your Heating

For radiator heating, you’ll usually have at least one 'circuit' or zone in the app.

Time Control and Setback Temperature

To set your basic heating pattern:

1. Tap your heating zone (for example, Zone 1).
2. Set operation mode to 'Time controlled.'
3. Choose a setback temperature (often around 16 to 17 °C).

The setback temperature is the level the system will maintain when it is 'off' in the schedule. It stops the house dropping too cold overnight, which would then take more energy to warm back up.

Weekly Heating Planner

Next, set your on/off times:

• Start time: about 30 to 60 minutes before you usually get up, so the house is warm when you wake.
• End time: about 30 to 60 minutes before you go to bed, so rooms stay comfortable into the evening.

You’ll also see a temperature on the right‑hand side for each heating period. This is actually an overheat limit, not a target room temperature. Many people set it to a temperature they would find slightly too warm (such as 22 °C), so if the house ever reaches that level due to sun or cooking, the heat pump will switch off and avoid overheating.

You can copy this schedule across every day, or adjust weekends if you get up later or stay up longer.

Heat Curve Settings

Instead of constantly turning on and off like a traditional boiler, a heat pump works best when it runs steadily, gently topping up heat to match what your home loses through its walls, windows and roof. The heat curve is how you set this up.

In the heat curve area you’ll see:

• Outdoor Temperature Switch-Off Threshold - for example, 20 °C. If it’s warmer than this outside, the heating turns off because you don’t need it.
• Minimum Flow Temperature - for example, 23 °C. This is the lowest temperature of water the heat pump will send to your radiators or underfloor heating.
• Steepness of Curve - this is the main control. It sets how much hotter the water gets as the outdoor temperature drops.

For example, at a certain setting you might see:

• At 10 °C outside: around 33 °C flow temperature.
• At −10 °C outside: around 47 °C flow temperature.

This balance aims to keep your home at a steady, comfortable level all the time.

Tuning the Heat Curve to Your Comfort

You don’t need to get hung up on the numbers. In practice, you:

• Live with the system for a few days.
• If you feel a bit cold, nudge the curve up slightly (for example by 0.05).
• If you feel a bit too warm, nudge the curve down slightly.

Lower numbers are more efficient but cooler, higher numbers are warmer but use more energy. The idea is for everyone in the home to agree on a comfortable level, then leave the curve alone once it’s right.

If you have more than one heating zone (for example upstairs and downstairs), you can apply similar heat curve settings to each, then tweak if one floor feels noticeably different from the other.

Why a 'Fabric First' Approach Matters

People often think in terms of setting a thermostat to a fixed number like 21 °C and letting the system repeatedly turn on and off. With heat pumps, that on/off cycling is not ideal.

Instead, you want the heat pump to tick over, constantly putting just enough heat into the home to match what’s being lost through the building fabric. When the heat curve is set properly:

• The house sits at a stable, comfortable temperature.
• The heat pump doesn’t have to work so hard or ramp up and down.
• Your overall efficiency and running costs are better.

The overheat temperature in your schedule is there mainly as a safety cap. On sunny days or when you’re cooking and have a lot of internal heat gains, the app can switch the heat pump off briefly to stop the house going too warm.

Sharing Access and Landlord Benefits

You don’t have to be the only one with control. In the myVAILLANT app you can:

• Go to Home → Manage Homes → Invite new user.
• Send an invite code to another person in your household.
• They add the code in their app and get access to the same home.

You stay as the admin user, so you can add or remove access. Up to five people can have the app linked to the same system.

For landlords, this is particularly useful:

• The landlord can monitor how the heating is being used.
• They can see efficiency and spot issues like pressure drops early.
• Tenants can still control their own heating, while the landlord has oversight and can prompt them if something needs attention.

Quick Everyday Tips

Once everything is set up, you don’t need to keep changing settings daily. In most cases you’ll just:

• Use Hot water boost if you run out of hot water.
• Use Ventilation boost when you want to open windows and air the home.
• Use Absence mode when you go away to keep the house safe but not overheated.
• Adjust the heat curve slightly if you feel consistently too warm or too cold.

If you’re ever unsure, you can always contact Glow Green for help reviewing your settings and making sure your myVAILLANT app and Connect Gateway are set up to give you comfortable, efficient and reliable heating.

myVAILLANT App FAQs