110 or 220 heated floor [Archive] - Ceramic Tile Advice Forums - John Bridge Ceramic Tile


View Full Version : 110 or 220 heated floor

04-10-2010, 10:05 AM
I bought 30 feet of 110 volt floor heating wire from stelpro to heat my bathroom floor.
I have an inependent 220 line to power it.

The salesman where I bought the kit said I only needed 110 for the size of floor I was covering. Did I make a mistake and would the 220 have been better?

The floor area is 6' by 7'
Thanks in advance.


Sponsored Links

04-10-2010, 11:06 AM
Welcome Ted,

When installing in-floor heat, you need to follow the manufacturers installation instructions for the type of wire, voltage, how to install, etc... You got the instructions? What do they say?

If you're unsure, post a link to what you have and we'll see if someone can help sort it out. Personally, I'm not familiar with that system. :)

04-10-2010, 11:23 AM
Welcome, Ted. :)

What Dana said.

Your "independent 220 line" can almost certainly be connected at the breaker box as a dedicated 120v circuit if desired to power the heating system so long as the wire size is adequate for the required load and the breaker is sized correctly for the wire.

I've also never heard of your particular heating system.

My opinion; worth price charged.

Old World Tile and Marble
04-10-2010, 11:38 AM
the 220 is more efficent in use heats floor quicker stays off longer

04-11-2010, 07:47 AM
Thanks for the opinions.

I will phone the salesman tomorrow and see how much of a hassle it would be to change it to 220. If it saves a bit on energy, in the long run it may be worth it.


04-11-2010, 08:02 AM
If your 110v system is designed to use 20A, the same one in 220v will use 10A. 20A = 12awg wire

04-11-2010, 09:54 AM
In your example, Derek, each system would use the same 220 watts of power. Not much saving there, eh?

May, indeed, be some additional efficiency involved as Jason points out, but I'm thinkin' a fella may be hard-pressed to spend the money and energy to change out the system and realize an actual savings in either area within a reasonable time.

Just hafta put a pencil to it all and see, though. :)

04-11-2010, 10:30 AM
220 VOLTS, not Watts, a 220 volt system will use half the amperage that a 110 volt system use. In essence you are using 2 x the 110 volt lines as opposed to just 1 x 110 volt line which in turn decreases the amount of amperage required each line. Still uses the same amount of power as the meter turns but is more efficient in means of operation. Take for example a pool pump motor ( or 2 ) 1 is 110v, other is 220v, the 220v motor will run cooler as their is less amperage on each line. The 110v motor will run hotter with 2x the amperage of a single line on the 220v motor, which in turn will cause the motor to run hotter, heat kills equipment and causes more energy to be pulled the hotter it gets to supply the same performance. So in a motor application the 220v will cost slightly less on the energy bill, I doubt with a heating element there will be any savings but it will not work as hard and will probably last longer as well as heat the floor quicker. Here's something else to ponder ......... to figure out how many watts a 220v system can handle just multiply the voltage by the amperage....220v x 20A = 4400 watts, also a 110v x 20A circuit = 2200 watts.

04-11-2010, 11:15 AM
Mr CX & Mr Ohm are acquainted. ;)

04-11-2010, 11:17 AM
Yep, yep, me and ol' Georgie Simon went to school together years ago. Well, sorta. Think he was in an earlier class. :)

04-19-2010, 01:45 PM
There is no difference in power consumption or performance with 120V and 240V, so far as electric radiant heat mats. I use Thermosoft mats on all my installs. They are 12 watts/s.f. in either voltage. You get charged per kilowatt hour rather than just voltage or amperage individually so it makes no difference. The only difference is you can only get up to 150 s.f. per t-stat with a 120V system and up to 300 s.f. on a 240V. Other than that, no difference at all. Call their sales reps for info. They're really knowledgeable and offer added discounts on top of their online pricing when you order by phone.

Brian in San Diego
04-19-2010, 02:59 PM
a 220 volt system will use half the amperage that a 110 volt system use.This is a misleading statement. A 240 VAC system will use the same amount of energy but divides the energy between two "legs". A dual voltage motor that uses 5 amps (per leg) when wired for 240 VAC would consume 10 amps when wired for 120 VAC. The result is the same...2 x 5 = 1 x 10. Same amount of consumption...same horsepower. The advantage comes in larger horsepowers because the wire size can be reduced when higher voltage motors are used. In my business a 4160 VAC 1500 HP motor consumes the same amount of electricity as a 480 VAC 1500 HP motor. The advantage to industrial customers is that they don't need to install transformers to reduce the incoming power from 4160 to 480 volts. There is absolutlely no electrical savings in the higher voltage motors and the 4160 volt motors don't run any cooler than the 480 volt motors. The advantage the 240 vac motor offers in a residential application is that it balances the load between the two 120 vac lines that are fed to the house and a smaller wire size can be used.


04-20-2010, 04:33 PM
Yes indeed, energy costs will be the same whether you use 110V or 220V.

In most cases, the voltage of the electric floor heating system depends on your house' voltage. In Canada, we typically sell 220V because houses are on 220V. In the US, we typically sell 110V because houses are on 110V. Electric floor heating are typically readily available in both volt options. We carry stocks for both.

It is worth pointing out that large projects (150sqft and more) typically use 220V for radiant floor heating. The reason is that 220V systems will draw half as many Amps as outlined in some posts above. A typical floor heating thermostat can handle 15 amps. In 110V, your thermostat can control about 100-120 square feet of floor heating. A larger area will require a 2nd thermostat or a relay. In 220V, your thermostat can control about 220-240 square feet of floor heating.

from WarmlyYours
24/7 Installation Support for Electric Floor Heating