However, some systems that are high voltage use a higher current (sometimes as high as 16A or higher) - for example, electric radiators or electric underfloor systems. The Nest Thermostat E’s  *  /OB connector lets you install a heat pump, a second stage of heating, or a second stage of cooling. Learn how OpenTherm works with Nest thermostats >. The installer must have access to the heating valve so they can connect it to the Nest Heat Link, which is included with your thermostat. It’s important to check that the smart thermostat is compatible with your central heating system. Hi just bought a nest e thermostat . For instance, your Nest Pro may need to install an additional fil pilote diode(sold separately) depending on your current system. Condensing boilers are also efficient because they adapt the amount of fuel burned according to how much heating is needed. The rest of the heating and cooling systems detailed in this article are not compatible with mainstream smart thermostats. So that amounts to at least $250 + $30 per heater, and you lose any smart benefits. Use our helpful tool to take an assessment of the existing wiring in your home. Nest Wiring Diagram You Got From Our Online Compatibility Checker. For more details, please see the following article: How the Nest thermostat works with zoned systems. If your thermostat has a short “jumper” wire between two connectors, don’t include that wire; only enter the labels for wires coming from inside your wall that are attached to the thermostat. Read the following article for more information: What to do if your thermostat’s wire connectors have two labels. Here is a brief compatibility test guide You may need to pull one out of the connector to check. High voltage thermostats are often built into the wall and typically have two to four thick wires coming out of the thermostat. They’re common in France and many electric radiators sold there since the 1980s are fil pilote enabled. Contact a local pro. If you think your system uses a proprietary communications protocol, contact a local Nest Pro installer in your area for help. You might have a line voltage (120v) system if… Your wires are thick and either 2 or 4 in quantity (probably just two or four, red and black or red and white in color) You operate your heater (s) on a room-by-room basis This protects you and avoids blowing a fuse in your equipment. I have seen other users who had this proprietary labeling method with the A, B, C, and D wires. Some systems have control panels or equipment interface modules that require a C wire to be compatible with Nest thermostats. Contact a local Nest Pro installer for help determining Nest compatibility. This is because you have to have a thermostat and relay system for each heater in your home. A Nest thermostat can also function as a humidistat to control your home’s relative humidity. However, you should contact a local Nest Pro installer and tell them that your apartment is heated with collective or district heating so they can ask you additional questions to determine Nest compatibility before they schedule an installation appointment. If you have one of these systems,  contact a local pro. High voltage systems are usually electric baseboard heating systems or other radiant systems powered by electricity. But Nest thermostats don’t need wired sensors since they get weather information over Wi-Fi. Check compatibility. These systems are sometimes called high impedance systems. Nest thermostats are compatible with many different types of heating systems, including boiler systems. Proprietary condensing boiler typically only work with a thermostat from the same manufacturer. Choose a product. Installing a low voltage smart thermostat like Nest or Ecobee with electric heating completely negates one of the major benefits of smart thermostats. Millivolt systems are typically wall heaters or floor heaters and use electricity or natural gas. The system wires may be compatible, but they may not show up in the compatibility checker because of this labeling methods.I’d suggest that you have a professional take a look at your system before making any decisions on buying or not. You may be able to install a C wire to make your system compatible with a Nest thermostat. There are two main reasons that a heating system may not be compatible with Nest thermostat: it’s high current or a proprietary system. Nest thermostats can work with systems that use Service Light (L) wires. Which wire goes to which connector for want of a better question ? Fil pilote thermostats can also have different modes such as: On, frost, night, and day. We are experiencing longer than normal wait times for support. The label on the wire connector is what you should enter. If your system doesn’t have a switch, turn off power to it at the breaker or fuse box. Some of these proprietary systems may also have the option to use standard heating system wires. Remember one thing, Nest learning thermostat is never compatible with any high voltage system like 120v or 240v. If your system only has two wires, but you have both heating and cooling, your system is likely proprietary. But there are a few of key differences between models. The Nest Thermostat is compatible with the majority of low-voltage, 24-volt systems but has a few exceptions, including incompatibility with line voltage, millivolt systems and a few others that might lead to problems with your Nest. They work with all common fuel types including natural gas, oil, and electricity. Nest thermostats are compatible with zoned systems, including zoned systems with dampers. Costs can vary depending on how difficult it is to route a new wire through your walls. There may be a switch on your system or near your system that looks like a regular light switch. 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