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Orbit 83521 Clear Comfort Programmable Thermostat

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Orbit 83521 Clear Comfort Programmable Thermostat



The evident comfort of Orbit Pro THERMOSTAT has a modern style that complements any home and includes all the functions of a fully programmable energy-saving THERMOSTAT. The need for manual changes is eliminated by the full 7-day programmability, which also enables customization of the heating and cooling up to four times per day. Requirements for power Input: 120V AC/60Hz AC Output 24V


The best firm for household irrigation in North America is called Orbit. We provide the most comprehensive ecosystem of solutions for hose faucets, hose, hose-end, underground, drip, mist, and yard protection, with a presence in more than 180 countries across 6 continents. We have led the sector in creative solutions for more than 50 years, amassing more than 100 current patents and several accolades from the business world.

From our technologically advanced, best-selling B-have smart controllers to our PVC-Lock, Blu-Lock, and Drip-Lock, which are incredibly quick ways to connect sprinkler pipe and drip tubing, we have modernized the industry, established the bar for residential irrigation best practices, and improved outdoor watering for homes all over the world. The modern commercial and agricultural counterpart of Orbit,

Hydro-Rain, offers BUILT FOR SPEED products that are designed especially for seasoned builders and producers. Together, Orbit and Hydro-Rain make up a business unit inside the Gardena Division of the Husqvarna Group, which is home to the largest residential watering manufacturer in the world. In order to continue pursuing our vision of CHANGING THE WAY THE WORLD WATERS, we are delighted to declare our commitment to offering a comprehensive ecosystem of smart solutions, including applications FROM FAUCET TO farms. Securing access to safe fresh water for communities is a global responsibility.

In The Box

  • Programmable Thermostat

Product Layout



  • Turn off the power
    The equipment for heating and cooling should be turned off.
  • 2 Take Off Cover
    The old thermostat’s front cover should be removed.
  • Wire labels
    Using the provided wire labels, identify the wire by the letter of its terminal instead of its color. Disconnect the wires after labeling them, then take the base off.

Tools Required For Installation

  • Screwdriver
  • Wire cutters/strippers
  • Drill with a 3/16″ (4.8 mm) drill bit
  • Level


  • Brand Orbit
  • Model 83521
  • Color White
  • Included Components Thermostat
  • Power Source Electric
  • Item Weight 0.58 Pounds
  • Voltage 120 Volts, 24 Volts
  • Display Type Manual
  • Control Type Button Control
  • Number of Items 1
  • Control Method Remote
  • Style Programmable
  • Backlight Yes
  • Product Dimensions 1.3 x 5.3 x 3.25 inches
  • Warranty Description 3-year limited


  • The sleek, modern style blends in with any decor, and the wide display and soft backlight make it simple to see even from across the room.
  • The early start option guarantees that the required temperature is reached by the predetermined time, ensuring that your home is always pleasant.
  • 7-Day programmability: you can set up to 4 programming periods for each particular day. Baseboard heaters (or other types of line voltage heating), multi-stage heating or cooling systems, and 3-wire hydronic systems cannot be used with this thermostat.
  • It is simpler to use and takes less time to program thanks to the copy feature (from day to day) and permanent and temporary hold mode.
  • For the best consistency in control, accurate temperature readings to +/- 1 degree Fahrenheit and Celsius are required.
  • A one-stage thermostat that is compatible with heat pumps without auxiliary or backup heating, central air conditioners, 2 wire hot water systems, millivolt systems, and gas, oil, or electric furnaces.

Customer Reviews

Unemployed Rocket Scientist United States 
I got this to swap out an old Robertshaw-programmed thermostat that, even with fresh 9V batteries, would occasionally act strangely. The new thermostat’s lower footprint was the sole issue during installation. The opening for the two wires was located differently than it was in the old thermostat, thus I couldn’t have utilized the original screw holes. My initial attempt at creating new screw holes disclosed some even older screw holes. I enjoy that the temperature display is considerably bigger, that AAA batteries are used instead of 9V batteries, and that the relay clicks quietly after the call for heat. It has been running on AAA rechargeable batteries for a week. The process of programming the new thermostat is very similar to that of the previous thermostat.
Rick Medugno United States
Programs that run quickly and easily. Good-sized, simple-to-read display. Fantastic copy features; just program one day, copy to all, and you’re done; alternatively, you can just change other days as necessary.
STLAmazon Customer United States
The Nest that was put in our new home didn’t sit well with us. The controller also stopped working whenever the internet did. This controller not only performs more tasks than our previous one, but it also looks good mounted on the wall and functions well with our pulse heater.
Daniel X Rey United States
I don’t utilize the programming function because my schedule is very erratic; instead, I simply use the buttons to increase or decrease the heater’s temperature. It’s perfect for that. The reason I want to get a new one is that my eyesight is a little blurry; it’s not so terrible that I have to wear glasses all the time, but I couldn’t read my old t-stat without them. That issue is resolved by the readout, which is large and obvious. And it looks fantastic.

Can an Orbit 83521 programmable thermostat be used manually?

Unfortunately, a lot of homeowners adjust the temperature manually on their programmed thermostat, just like they would with an analog one. Avoid misprogramming your thermostat or turning off the programmable feature.

What is the average life of an Orbit 83521 programmable thermostat?

Your thermostat will ultimately become obsolete, just like any other technology. Modern home thermostats typically last 10 years, but they are often updated earlier due to market advancements

What is the best way to use an Orbit 83521 programmable thermostat?

Set your thermostat to 78 degrees in the summertime when you are at home. Set it to 68 degrees when you are home during the winter. Set your thermostat to turn down the heat or air conditioning 60 minutes before you go to bed at night and to turn it up 30 minutes before you get up in the morning.

Can you override an Orbit 83521 programmable thermostat?

Multiple daily settings (six or more temperature settings per day) can be stored and repeated by programmable thermostats, and you can manually override any of those settings without impacting the rest of the daily or weekly schedule.

Does an Orbit 83521 programmable thermostat have to be programmed?

Actually, programmable thermostats are made so that you may “set it and leave it.” Your home will be more comfortable and you’ll be able to save money at the same time if you take a few minutes after your thermostat is installed to properly arrange your schedule.

How often should you replace an Orbit 83521 programmable thermostat?

The average home thermostat lasts 10 years. However, as more recent, more effective thermostats hit the market, you could need to replace yours sooner.

How long do batteries last in an Orbit 83521 programmable thermostat?

Batteries for thermostats typically last 8 to 12 months and aid in maintaining settings during power outages. Low batteries in digital thermostats are a frequent reason why your home’s heating and cooling system won’t work.

Does an Orbit 83521 programmable thermostat save energy?

The short answer is that programmable thermostats do indeed save energy. It takes appropriate installation, setup, and use to maximize savings. You should keep in mind that you will consume 1% less energy for every degree you lower your thermostat.

Should you adjust your Orbit 83521 thermostat throughout the day

Your HVAC system will often work continuously to maintain the desired temperature in your home. The implication of this is that your furnace or air conditioner might operate while you’re asleep, at work, or away from home.

How many wires do you need for an Orbit 83521 programmable thermostat?

This thermostat requires a minimum of three low-voltage wires: a black, a white, and a wire that powers the thermostat. The black and white wires are used to turn on and off the furnace. Call an electrician or HVAC contractor to run the additional 18- or 22-gauge wire if you only have two wires.

Are all Orbit 83521 programmable thermostats the same?

Depending on the model you select, programmable thermostats allow you varied levels of customization: You can have a new schedule every day of the week with 7-day models. The 5-day workweek plan for 5+2 models is the same, however, the weekend schedule is different.

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