Take the guesswork out of heat pump installation

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Find out how the Passiv Smart Thermostat can make your installations stand out from the crowd by reducing your customer’s heating bills by 30%.

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Contact the team for help or to find out how to become a Passiv Smart Thermostat installer.

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Our Installer Help Centre will guide you through everything you need to know to install the Passiv Smart Thermostat.

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Why install the Passiv Smart Thermostat?

The Passiv Smart Thermostat removes the need to set a weather compensation curve. Instead, it learns how a home heats up and cools down and continuously optimises the heat pump’s flow temperature to maximise its COP.

The Passiv Smart Thermostat can be installed with wired or wireless thermostats. The Passiv Programmer features a built-in, push-fit wiring centre and is used to commission the system in under two minutes without a smartphone or internet connection.

Remotely monitor all your installations with the free Passiv Portal. The Portal is a web-based dashboard offering powerful insights into heat pump performance, with live and historic data on temperatures, energy use, and settings.

The Passiv Smart Thermostat can optimise a heat pump to consume cheap electricity from time-of-use energy tariffs and supports smart tariffs from the UK's leading energy suppliers. It can also optimise a heat pump to consume free electricity from rooftop solar panels without any additional monitoring equipment.

Say goodbye to weather compensation curves

The Passiv Smart Thermostat removes the need to set a weather compensation curve. Instead, it learns how a home heats up and cools down and continuously optimises the heat pump’s flow temperature to maximise its COP.

This ensures perfect comfort for your customers while maximising heat pump efficiency. The Energy Saving Trust verified that the Passiv Smart Thermostat increases a heat pump's COP by 17%.

Carilyn cut her heat pump bills by 40% with the Passiv Smart Thermostat

Carilyn installed the Passiv Smart Thermostat after struggling with her previous heat pump controls.

Since making the switch, her heating bills have fallen by 40%, while comfort in her home has noticeably improved. The Passiv Smart Thermostat automatically optimises her heat pump to work with the Octopus Cosy heat pump tariff from Octopus Energy—so she no longer needs to manually adjust settings to make the most of cheaper electricity.

Remotely monitor every install with the FREE Passiv Portal

The Passiv Portal is a free, web-based dashboard offering installers powerful insights into heat pump performance, with live and historic data on temperatures, energy use, and settings.

View and manage all heat pump installations in a single location. Reduce unnecessary site visits, respond faster to issues, and deliver better customer support without juggling multiple manufacturer portals.

Meet the Passiv Smart Thermostat

Passiv Thermostat

The Thermostat displays the current temperature, setpoint and status of the heating zone. Use the Thermostat to quickly adjust setpoint temperatures and manage home comfort. The Thermostat is available as a wired or wireless version. The wireless thermostat features a built-in rechargeable battery that can be recharged with a USB-C cable in under an hour!

Passiv Programmer

The Programmer gives complete control of heating and hot water in the home. Use the Programmer’s rich colour screen and intuitive interface to create, edit and delete schedules, boost hot water or turn on Away mode.

Passiv app

The free Passiv app for Apple and Android devices is the easiest way to control a heat pump - use the app to quickly and conveniently manage heating and hot water from anywhere.

Passiv Hub

The Hub is the brains of the Passiv Smart Thermostat and runs the clever algorithms that enable the 30% bill savings, smart preheating and Greener Grid Payments. The Hub should be connected to the internet to use the Passiv app.

Passiv Portal

The Passiv Portal is a free, web-based dashboard offering installers powerful insights into heat pump performance, with live and historic data on temperatures, energy use, and settings. View and manage all heat pump installations in a single location without juggling multiple manufacturer portals.

Passiv Smart Thermostat
Passiv Programmer
Passiv app screen
Passiv Hub

Make the most of the sun with solar optimisation

For homes with rooftop solar panels, the Passiv Smart Thermostat can also optimise a heat pump to make the most of any free solar generation.

This doesn’t require any additional metering or monitoring equipment. The Passiv Smart Thermostat forecasts the amount of electricity that solar panels will export back to the electricity grid using information about a solar installation entered in the Passiv app and a local weather forecast.

See the Passiv Smart Thermostat in action

Want to try the Passiv Smart Thermostat? Download the Passiv app and access Demo mode. Demo mode lets you explore all the features of the Passiv Smart Thermostat without a physical installation or a Passiv account.

If you’d prefer a hands-on experience, why not visit our Newbury office for an in-person demo? See the Passiv Programmer and Thermostat in action and discover the benefits of smart heat pump control for yourself.

See the Passiv Smart Thermostat in action

Quick and simple installation

1. Wire in the Passiv Programmer

The Passiv Programmer is installed in the same location as a standard central heating programmer, most likely near the hot water tank. The Programmer can be attached directly to a wall or onto a vertical, flush-mounted, 2-gang back box to aid cable management. The Programmer contains a built-in wiring centre to simplify the heat pump installation and should be connected to any zone valves, auxiliary pumps and the heat pump itself. The wiring connections and cable clamps are all push-fit to allow for a speedy, hassle-free installation.

2. Connect the Passiv Hub

The Passiv Hub is wired into the Programmer and connected to the home broadband router with the supplied ethernet cable. The Hub is mounted onto the supplied Hub wall bracket. An internet connection is not required for installation or commissioning and is only needed if the homeowner wants to use the Passiv app.

3. Join the Passiv Thermostats

Wired Passiv Thermostats are connected to the Programmer using standard 2-core cable (pre-existing or newly installed) and will pair automatically with the Programmer. The wired Thermostats are mounted onto the supplied Thermostat wall brackets. These can be attached directly to a wall or onto a flush or surface-mounted 1-gang back box to aid cable management. Wireless Passiv Thermostats should be charged up and paired with the Programmer at the commissioning stage. The wireless Thermostats are mounted onto the supplied Thermostat wall brackets. The Thermostats are recharged with a USB-C cable.

4. Commission the system

The Passiv Smart Thermostat is commissioned from the rich colour screen of the Passiv Programmer in under two minutes without the need for a smartphone or internet connection. Just follow the simple on-screen commissioning steps to complete the installation. The Programmer also features several handy installer tools including an immersion test and the ability to set a permanent or temporary maximum flow temperature.

5. Handover to the customer

The Passiv app and in-home controls have simple, intuitive user interfaces for a seamless handover to a homeowner. The Passiv app provides clear steps to guide a customer through the process of creating an app and controlling the Passiv Smart Thermostat from a smartphone.

Inside the Passiv Programmer
Passiv Hub
Passiv Smart Thermostat pairing screen
Passiv Programmer commissioning screen
Passiv app set up screen

What heat pumps does the Passiv Smart Thermostat work with?

For full optimisation, the following brands are compatible with RS485 Modbus control:

Further brands are supported with relay control. For information on the control types, visit our Installer Help Centre.

Installer FAQs

There are no special tools required for installing the Passiv Smart Thermostat. The Passiv Smart Thermostat is commissioned from the rich colour screen of the Passiv Programmer in under two minutes without the need for a smartphone or internet connection.

The Passiv Smart Thermostat has been designed to be simple to install and commission. It has several features to speed up heat pump installation including removing the need for an installer to set a weather compensation curve, a built-in, push-fit wiring centre, wired or wireless thermostats and the ability to commission the system from the Passiv Programmer in under two minutes without the need for a smartphone or internet connection.

The Passiv Smart Thermostat can control a heat pump via RS485 Modbus or relay. Control via RS485 Modbus is possible with many leading heat pump brands and delivers the best level of bill savings, including increasing the efficiency of a heat pump by 17%.

Control via relay is possible with all heat pump makes and models. With relay control, the Passiv Smart Thermostat will only control space heating and not hot water.

The chosen control method will impact how the Passiv Smart Thermostat is installed and the functionality available on the Passiv app, Thermostat and Programmer. Visit our Help Centre to find out more.

The Passiv Smart Thermostat can optimise a heat pump to consume cheap electricity from time-of-use energy tariffs and supports smart tariffs from the UK’s leading energy suppliers.

For a list of supported tariffs, visit our Help Centre.

The Passiv Smart Thermostat can support the majority of heat pump installations. For more information or to ask about a specific configuration, get in touch with us by visiting the Contact page.

No! Unlike many other smart thermostats, every feature of the Passiv Smart Thermostat is included for free. There are no ongoing charges for using the Passiv Smart Thermostat.

The Passiv Help Centre is available 24/7 and is the quickest way to get support. If you still need to get in touch with us, please visit the Contact page for more information.

See more FAQs >

Want to start installing the Passiv Smart Thermostat?

The Passiv Smart Thermostat can be purchased from your local plumbers' merchant or renewable distributor.

Get in touch to book a demo or find out more.