Many homeowners wonder how they can calculate the current total wattage of their baseboard heaters in each room. If you’re thinking about purchasing **Mysa Smart Thermostats** for your home, you should know there’s a limit: **Mysa can handle up to 3,800W**. This is around the standard for any high voltage thermostat. We strongly recommend you do not exceed this wattage.

But now you’re asking:

“By golly, how do I know if I’m over the limit?”

Well, there’s a couple of ways to check:

# Method One

The easiest and simplest way to calculate the total wattage of your current baseboard heaters is to locate the manufacturer’s label on your heaters. The wattage is often listed on a sticker. If the wattage is not listed on the label, you can determine the wattage of each heater with this simple formula:

If you get the information directly from a sticker on the heater, it should be an exact figure and not an estimate.

**Method Two**

If you are unable to read or locate the manufacturer’s label, then you can estimate the wattage for each baseboard by measuring the length. As a general rule, you can **approximate** the heater’s wattage by using the following calculation:

**However, **remember that this is an **estimate**. If your calculations come anywhere close to the 3,800W limit, please consult a professional to make sure that Mysa is compatible.

# Multiple Heaters

Remember that your total wattage must include every heater attached to a single thermostat. To calculate this, simply calculate the wattage of each heater and add them all together.

If you’re anywhere under 3,800W it’s about time you Meet Mysa!

Very nice! Thanks.

So if one has a large home with baseboard electric heaters what is one to do? I have 5 Aube thermostats controlling 4 large StelPro (~6ft) baseboard heaters. (The fifth one is in a walk in closet and can be left as it is.)

Hi Charles,

You could simply get one Mysa per baseboard heater. We currently have a discount for bundles of 3 or 5 units. I hope that helps!

I have four baseboard electric heaters with a total rating of 4,190W in a single room controlled by an existing King single-pole thermostat. If I am reading you correctly, I would not be able to replace that thermostat with a Mysa? One of the four heaters is a small 420W unit that I could uninstall to bring under your 3,800W limit, I suppose.

That is correct, Bryan.

Will mysa work as an ordinary thermostat without WiFi? I’m updating a cottage that I haven’t yet put internet at- the options for that are actually limited, so I need to put some thought into which type to choose.

Yes, but just a standard up and down thermostat. In order to use smart features and scheduling you will need WiFi.

My electrician says I need 30amps for my two long baseboard heaters that are currently on their OG 1968 Art Deco thermostat! Do you have a smart thermostat compatible with that?

Unfortunately Mysa maxes out at 16 amps. We don’t have a product that supports such an amperage.

Would like to install on a 240V circuit with 2 baseboard heaters. Each is 8.3A, so 1992W each= 3984W total. Yes…JUST over the 3800w max recommendation. Being so close, could I get away with your system on this? I am hoping the recommendation is at least a little conservative. Looking forward to your response.

We are certified for 3800W, so we do not recommend going over that.

Hello!

What happens if it’s a bit higher, like 4000w. Will it works? Will it restart by itself? Will it stay Closed?

Thanks!

It is incompatible with 4000W, which means that it an electric hazard to hook up at all.

I have radient heat in my ceilings. I also have small baseboards in areas like the hall & bathrooms. I have thermostats in every room,so I’m guessing that there is no radient heat through the ceilings in the hall & bathrooms or I wouldn’t have the baseboards. The thermostats are 240v high voltage system. Am I compatable for a mysa? Also,during a natural power outage or power surge due to weather,will the thermostat reset to a different degree if I’m not home,does it have memory or what will it do? Thank you for your help.

Mysa could possibly be compatible with the above system if the system meets the required specifications, which you can find on http://www.getmysa.com

The number of wires, amperage, and wattage are all very important when it comes to radiant heat.

After a power outage, when the Mysa comes back on it will return to the last temperature it was set to.

Hi! My new Mysa has been connected for 7 hours now, and the room is cold, baseboards barely heating (set to 23 but stays at 19), all within specs ( 3 BB for 3000w total) and wifi working great… what is the possible issue? Its make or break at this point!

Hey Christian,

Sorry you’re having issues. It would be best to contact our support team at support@getmysa.com to help you further.