Thermostat for Williams wall heater guide

Williams wall heater requires a millivolt thermostat with voltages as low as 0.75 volts. You can also use these thermostats in gas furnaces and wall heaters of other brands as well. In this post, we will share both programmable and nonprogrammable thermostats for Williams wall heaters.

In some states of the United States, the temperature drops significantly at night, so programmable thermostats give you the benefit of not needing to adjust them manually again and again.

That is why these programmable thermostats are a bit costly compared to non-programmable ones.

While the Williams wall heaters are excellent, sometimes they don’t have their thermostats to control the temperature. This is why I found it quite convenient when I installed my wall heater to get a thermostat alongside it. Not all thermostats are compatible with William wall heaters, so I did have to search and cross-check a little bit, but you won’t have to as you can confidently choose from the thermostats I have mentioned in this article.

Before proceeding further, I want to thank you for liking the article about thermostats for oil or water-based baseboard heaters.

Which thermostat to choose for Williams wall heater

You are not bound to purchase only thermostats from the Williams brand only. But you should remember that for furnaces and Williams wall heaters, you need millivolt thermostats that only operate at 0.75 volts or 750 millivolts. These millivolt thermostats usually have two wires connecting them with the Williams wall heater.

What is Williams’s wall heater?

Williams wall heater is a type of gas furnace. It uses a millivolt thermostat to control the temperature. The thermostat has a low voltage of 0.75 volts. This enables it to be used in various furnaces and wall heaters. Williams wall heater is mainly used in commercial establishments and factories. Due to its high price tag, it is not recommended for use in residential homes.

Pros and Cons

Some of the benefits of using a Williams wall heater include:

-It is very efficient in terms of energy consumption.

-It can maintain a consistent temperature throughout the entire space that it is installed in.

-Williams wall heaters are very durable and have a long lifespan.

What are the drawbacks of using a Williams wall heater?

Some of the potential drawbacks of using a Williams wall heater include:

-The initial cost of purchasing and installing a Williams wall heater can be high.

-These types of heaters require regular maintenance to keep them running efficiently.

-If not installed properly, Williams wall heaters can pose a fire hazard.

Safety measures

There are a few safety measures that should be taken while using Williams wall heaters:

-Make sure that the area around the heater is clear of any flammable materials.

-Do not leave the heater unattended while it is in use.

-Be sure to follow the manufacturer’s instructions when operating the heater.


Williams wall heaters are primarily used in commercial and industrial settings. They are not recommended for use in residential homes. Some of the familiar places where you might see a Williams wall heater include:





-Retail stores

Thermostat brands

Columbus Milli-volt Thermostat
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Williams P322016 Thermostat
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Honeywell Non-Programmable Thermostat
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Honeywell Programmable Electric Thermostat
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Honeywell CT53K1006 millivolt Thermostat
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Columbus Milli-volt Thermostat

It is from the famous Brand TPI. It is most suitable for heat-only systems like Williams furnace or wall heaters temperature controlling. It allows you to control temperatures in the ranges of 35-75°F / 2-24°C
It accepts both power sources, i.e., Ac and Dc.
You can easily mount it to any wall with screws that come along.
It is Millivolt Only and comes with Alcohol Thermometer that precisely shows the temperature in both units.

Williams P322016 Thermostat

This is the original thermostat from the Williams brand for furnace and wall heaters. It allows you to attach it to your bedroom wall or directly to the Williams wall heater. It is easy to operate with its slide control. The slide control is durable and tested by our testing department. It gives you the ability to set temperature from 50°F to 90°F.

Honeywell Non-Programmable Thermostat

In terms of thermostats, without a single shred of doubt, I can say that Honeywell is the leading brand. It has the best, most reliable, and easily affordable thermostats. Simply put, they have the biggest hand in the pie. This nonprogrammable thermostat is a state-of-the-art, simple yet modern piece of technology that is perfect for the day-to-day needs of most people.

It is silent and does not make a lot of noise. It has a great display that shows the temperature in both Celsius and Fahrenheit. Moreover, it has precise temperature control with an astonishing accuracy of up to 0.15 degrees Celsius or 0.27 degree Fahrenheit. This model comes in a compact, slim design specifically designed for easy DIY installations. You don’t have to worry about hiring a professional for a menial task. It is one of the top ten thermostats for Williams wall heaters and furnaces.

Honeywell Programmable Electric Thermostat

While analog or mechanical thermostats are perfectly alright and get done, programmable digital thermostats bring the heating experience up a notch. Personally, my family and I also prefer these because of the convenience they promise. With the Honeywell programmable thermostat, you get up to 4 programs per day, battery-free backup, and an excellent backlit display that makes everything a little bit easier.

This means you can change between different temperature profiles throughout the day without having to adjust the dial every single time yourself. It switches automatically according to your needs. A higher heat setting in the early morning but a dialed down setting in the afternoon when the sun is up, and it isn’t quite as cold outside.

You can even have different separate programming for weekends when you are home most of the day and weekdays when you aren’t. This model features fast and easy two-wire installation and TRIAC silent switching, so there’s no extra hum in the house that might annoy you. Separate programming for the weekdays and weekends.

Honeywell CT53K1006 millivolt Thermostat

From manual, we come back to another digital with the CT53K1006 from Honeywell. This one is non-programmable and works based on a bimetal temperature sensor. It’s easy to install, economical, and pretty cheap. It has no special features, but it is compatible with Williams wall heaters and can run one just fine. If you’re on a tight budget or just don’t care enough about it to spend that much money, then this is the one for you.

This thermostat is easily one of the best ones you can have in your home; I will say that. As someone who used to own this exact model, I can personally vouch for the reliability and sturdiness of this product. It went 5 years without a hitch and then two more with some issues here and there before I decided that maybe it was time for an upgrade. I would recommend this model to anyone unsure of what to buy.

It is one of the top thermostats for Williams wall heaters and furnaces. It is better than other options out there simply due to its sturdy and long-lasting. You buy it once; you buy it for a lifetime. Well, a cat’s lifetime but a lifetime nonetheless.


Our review team tried to choose the best thermostats for Williams wall heaters and furnaces. Please let us know about your buying decision in the comments section below.

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