Four quick questions, then pick the kit that matches your floor. DFT cable for odd-shaped rooms, DMC cable if you are using an uncoupling membrane, Elite mats when the room is mostly a rectangle. Give us a call if you want a second set of eyes on the square footage.
A few questions first
Answer these before you open a chart
- 120 V or 240 V? Warm Tiles® runs on either. Decide before you order — the kit voltage has to match the circuit.
- What’s under the floor? A room over another heated space uses standard spacing. Concrete slabs, rooms over unheated areas, and high-loss spaces (the catalog names solariums) use tighter spacing.
- Simple rectangle, or lots of ins and outs? DFT and DMC cable follow the walkable floor around fixtures. Elite stock mats are rectangles. Irregular rooms use a factory custom WTE mat.
- Do you want a schedule? FGS, ES, and ESW can run a schedule. FG is a simple on/off temperature control.
Pick the product family
All three use a Warm Tiles® thermostat and the same floor sensor idea
Measure only the walkable floor
Skip cabinets, the toilet flange, and a small border at the walls
Heated area is the walkable floor only — not cabinets, the toilet, or other fixtures. The catalog allows a border of 1½" to 6" from walls so the selected kit can fit. Keep heating cable at least 1½" from other cable, walls, vanity kick plates, and fixtures. Split the room into easy rectangles (and a triangle if you need one), then add them up.
Catalog example: A 7.5 + B 2.5 + C 15 = 25 sq ft heated.
DFT cable kits
Lace the cable. Snap it into the strapping in the kit.
Cable follows the walkable floor and stops at the vanity, toilet, and tub. Factory cold lead goes to the thermostat box.
Typical DFT layout from the Warm Tiles catalog. 25 sq ft heated → DFT 1022 standard or DFT 1030 alternating (120 V).
Standard spacing is 3" (3 hubs on the strapping) for floors over a heated area. Alternating spacing is 3" / 2" / 3" / 2" for concrete slabs, rooms over unheated areas, and high heat loss. Use the same spacing over the whole floor. Installed per instructions, DFT is designed to supply at least 12–15 W/ft².
Left: standard 3". Right: alternating 3" / 2".
Pick 120 V or 240 V to match the circuit. Charts below are from the Warm Tiles catalog.
120 V DFT
| Model | Standard sq ft | Alternating sq ft | Amps |
|---|---|---|---|
| DFT 1011 | 10–13 | 8–10 | 1.1 |
| DFT 1016 | 14–18 | 11–14 | 1.6 |
| DFT 1022 | 19–26 | 15–22 | 2.2 |
| DFT 1030 | 27–34 | 23–28 | 3.0 |
| DFT 1039 | 35–42 | 29–35 | 4.0 |
| DFT 1048 | 43–54 | 36–45 | 5.1 |
| DFT 1059 | 55–65 | 46–54 | 6.4 |
| DFT 1069 | 66–72 | 55–60 | 7.4 |
| DFT 1079 | 73–82 | 61–68 | 8.5 |
| DFT 1088 | 83–92 | 69–76 | 8.8 |
| DFT 1098 | 93–102 | 77–84 | 9.6 |
| DFT 1108 | 103–113 | 85–95 | 10.7 |
240 V DFT
| Model | Standard sq ft | Alternating sq ft | Amps |
|---|---|---|---|
| DFT 2021 | 18–25 | 15–21 | 1.1 |
| DFT 2031 | 26–35 | 22–29 | 1.6 |
| DFT 2053 | 48–55 | 40–46 | 2.6 |
| DFT 2065 | 60–70 | 50–58 | 3.3 |
| DFT 2078 | 71–83 | 59–70 | 4.0 |
| DFT 2095 | 90–100 | 75–84 | 5.1 |
| DFT 2118 | 110–130 | 91–108 | 6.3 |
| DFT 2137 | 131–145 | 109–120 | 7.4 |
| DFT 2157 | 146–165 | 121–137 | 8.5 |
| DFT 2175 | 166–184 | 138–153 | 8.8 |
| DFT 2195 | 185–204 | 154–169 | 9.6 |
| DFT 2215 | 205–225 | 170–187 | 10.7 |
Choose the kit whose range covers your heated square footage. Do not cut the heating cable to "make it fit.” Only the black cold lead may be shortened at the box.
DMC cable kits
For uncoupling membrane. Press the cable into the channels.
Measure the walkable floor the same way. Then press the cable into the membrane (or DMCS strapping) at one consistent spacing.
Same bath, walkable area only. Count channels, not floor inches.
Do not let the cable touch, cross, or overlap itself. On a membrane with 1.25" hub spacing: standard = 3 channels (3¾", 12 W/ft²); alternate = 3 then 2 channels (3¾" and 2½", 15 W/ft²); dense = 2 channels (2½", 18 W/ft²).
In the membrane: standard · alternate · dense.
Same three spacings on DMCS strapping if you are not using a membrane.
120 V DMC
| Model | Standard sq ft | Alternate sq ft | Dense sq ft | Amps |
|---|---|---|---|---|
| DMC 1012 | 13–15 | 11–12 | 8–10 | 1.3 |
| DMC 1016 | 16–20 | 13–17 | 11–14 | 1.7 |
| DMC 1021 | 22–25 | 18–21 | 15–17 | 2.3 |
| DMC 1025 | 25–30 | 21–25 | 17–20 | 2.6 |
| DMC 1031 | 31–37 | 26–31 | 21–25 | 3.3 |
| DMC 1042 | 39–52 | 33–43 | 26–34 | 4.4 |
| DMC 1053 | 53–63 | 44–52 | 35–42 | 5.5 |
| DMC 1065 | 63–77 | 52–64 | 42–51 | 6.7 |
| DMC 1081 | 80–94 | 66–78 | 53–63 | 8.3 |
| DMC 1097 | 96–112 | 80–94 | 64–75 | 10.0 |
| DMC 1114 | 111–134 | 92–112 | 74–90 | 11.8 |
240 V DMC
| Model | Standard sq ft | Alternate sq ft | Dense sq ft | Amps |
|---|---|---|---|---|
| DMC 2021 | 22–25 | 18–21 | 14–17 | 1.1 |
| DMC 2025 | 25–30 | 21–25 | 17–20 | 1.3 |
| DMC 2031 | 31–37 | 26–31 | 21–25 | 1.6 |
| DMC 2042 | 39–52 | 33–43 | 26–34 | 2.2 |
| DMC 2054 | 54–64 | 45–53 | 36–43 | 2.8 |
| DMC 2063 | 62–75 | 52–62 | 41–50 | 3.3 |
| DMC 2081 | 79–97 | 65–80 | 52–64 | 4.2 |
| DMC 2097 | 94–114 | 78–95 | 63–76 | 5.0 |
| DMC 2113 | 112–130 | 94–109 | 75–87 | 5.8 |
| DMC 2131 | 130–150 | 108–125 | 87–100 | 6.7 |
| DMC 2163 | 157–190 | 131–158 | 104–127 | 8.3 |
| DMC 2196 | 190–227 | 158–189 | 127–151 | 10.0 |
| DMC 2231 | 225–265 | 187–221 | 150–177 | 11.8 |
If you are on the line between two kits, give us a call and we will pick with you.
Elite (WTE) mat kits
⅛" fabric. About 15 W/ft². Built for rectangles.
Stock mats are rectangles. Custom mats (bevel, hole, notch, L) are made at the factory for rooms with fixtures in the way. Do not alter the length of the heating cable inside the mat. Only the cold lead may be shortened at the electrical box.
Left: standard rectangles. Right: custom coverage around fixtures.
Factory custom shapes: bevel, hole, notch, L.
Measure the walkable rectangle (or a few rectangles). Pick a mat — or two — whose listed heated area is at or just under that number. When using more than one mat, keep the outside wires of adjacent mats 1½" to 3" apart.
Part numbers read as WTE + length + width + voltage. Example: WTE0400481 is 40" × 48", 120 V, 13.3 sq ft. Change the last digit to 2 for the same size in 240 V.
Standard 120 V sizes from the catalog
| Model | Length × width (in) | Heated area sq ft |
|---|---|---|
| WTE0400271 | 40 × 27 | 7.5 |
| WTE0400321 | 40 × 32 | 8.9 |
| WTE0400401 | 40 × 40 | 11.1 |
| WTE0400481 | 40 × 48 | 13.3 |
| WTE0480241 | 48 × 24 | 8.0 |
| WTE0600241 | 60 × 24 | 10.0 |
| WTE0720361 | 72 × 36 | 18.0 |
| WTE0960481 | 96 × 48 | 32.0 |
| WTE1180241 | 118 × 24 | 19.7 |
| WTE1180301 | 118 × 30 | 24.6 |
| WTE1180361 | 118 × 36 | 29.5 |
| WTE1180421 | 118 × 42 | 34.4 |
| WTE1180481 | 118 × 48 | 39.3 |
| WTE1180601 | 118 × 60 | 49.2 |
Stock lengths run 40" to 118". Stock widths run 24" to 60" (not every length/width pair is offered). The catalog lists the matching 240 V models with a 2 at the end and the same square footage. Factory custom mats (bevel, hole, notch, L) are ordered when a stock rectangle leaves too much floor cold. Multiple mats can share one thermostat if the total load stays at or under 15 A.
Thermostat and power
Every kit needs a Warm Tiles® control and a GFCI-protected circuit
Use a current Warm Tiles® control from the catalog. All four stats below are dual-voltage, 15 A, with built-in GFCI.
| Model | What it is | Load |
|---|---|---|
| FG | Non-programmable floor-sensing thermostat | 120/240 V, 15 A |
| FGS | Programmable floor-sensing thermostat (5/2 or 7-day) | 120/240 V, 15 A |
| ES | ColorTouch thermostat — floor, air, or both | 115/230 V, 15 A |
| ESW | Wi-Fi ColorTouch — same as ES, plus app / browser control | 120/240 V, 15 A |
| RK1 | Relay kit when the load is over 15 A | 120 V, 24 A |
| RK2 | Relay kit when the load is over 15 A | 240 V, 24 A |
- Match kit voltage to the circuit. These stats accept both 120 V and 240 V.
- Stay at or under 15 A on the thermostat. Above that, add RK1 (120 V) or RK2 (240 V) and a second feed.
- DFT kit combinations over 10 A should be connected by a qualified electrician (catalog note).
- These thermostats include a built-in GFCI. In a bathroom, the National Electrical Code still requires the circuit to be GFCI protected — confirm the requirement with your electrician or inspector.
- A Detecto DT1 fault indicator monitors the cable during installation. It is not used to locate a fault after the floor is finished.
Step 3: Thermostat Kit Selection Basics
How do I know which Warm Tiles® Thermostat Kit to buy?
Once you've chosen the Cable Kit(s) or Mat Kit(s) to cover your space, you'll need to add a Thermostat Kit for temperature control. Refer to the Chart below. Simply choose between a programmable or non-programmable model that matches your power supply and Cable Kit(s) or Mat Kit(s) voltage. The Warm Tiles® Thermostat Kit is designed for easy installation by a skilled do-it-yourselfer. However, you should always consult your local electrical inspection agency prior to beginning your installation. Refer to the Thermostat Installation and Operation Instructions in every Kit. Instructions vary between programmable and non-programmable models.
Product Selection Chart for Thermostat Kits
| Warm Tiles® Thermostat Kits | |||
| Model No. | Voltage | Programmable/ Non-Programmable | Maximum Amperage |
| FGS | 120/240 Dual Voltage | Programmable | 15 Amps |
| FG | 120/240 Dual Voltage | Non-Programmable | 15 Amps |
Other Manufacturers Thermostat Choices
| Honeywell/Aube Thermostat Kits | |||
| Model No. | Voltage | Programmable/ Non-Programmable | Maximum Amperage |
| TH114-AF-120GA | 120 Volts | Non-Programmable | 15 Amps |
| TH114-AF-240GA | 240 Volts | Non-Programmable | 15 Amps |
| TH115-AF-GA | Dual Voltage | Programmable | 15 Amps |
Step 4: Large Floor Warming Installations
For larger spaces, more than one Warm Tiles® Cable or Mat Kit can be attached to a single thermostat as long as the total combined amperage of the kits do not exceed 15 Amps. If the heated area requires more than 15 Amps of load, you can choose to separate the area into more than one zone, each with its own thermostat contol, or install aRelay Kit.
What are Relay Kits?
Relay Kits are 24 Amp switches that are controlled by a single thermostat. Like a thermostat, each relay can have two cable or mat kits attached to it, but can handle up to 24 Amps of load instead of the 15 Amp load maximum on a thermostat. When combined with the 15 Amp capacity of a thermostat, up to 39 Amps of floor heating load can be controlled by a themostat/relay combination. If this still doesn't cover the area you want controlled by a single thermostat, add another relay for an additional 24 Amps of load capacity. With a thermostat/relay/relay combination, up to 63 Amps of load can be controlled by a single thermostat. Keep in mind however that, like thermostats, relays require an electrical circuit (usually 30 Amps each) to operate, and must be connected to a thermostat and each other as per the instructions included with each Relay Kit. This requires the ability to install the appropriate electrical conduit during the rough-in process, or having access during a renovation. As a final note,relays are typically housed in a separate electrical box at outlet height, and can be placed near the thermostat, or in any part of the room for ease of connection.
We hope this information was helpful. For additional information, refer to the other sections of this website (Literature, Video Training, Tutorials, FAQ's, Troubleshooting), or contact us directly with your questions.