When installing radiant floor heating, both porcelain and ceramic tile are a suitable floor finish due to their heat transfer and heat retention properties. Choosing one or the other depends on your budget, room type, and heating requirements.
Whether you’re doing a bathroom renovation, renewing a kitchen, or constructing a new build, understanding the differences between porcelain and ceramic tile can help maximize the performance and longevity of your floor heating system.
In this article, we’ll go over:
- Why porcelain and ceramic tiles work well with underfloor heating
- What the differences are between porcelain and ceramic tiles
- What type of radiant heating system works best with them
- Which tile is best to use, depending on project needs
Why do porcelain and ceramic tiles work well with radiant floor heating?
Porcelain and ceramic tiles are among the most efficient floor coverings to use with floor heating because of how well they conduct and store heat.
As opposed to carpet, vinyl, and some wood finishes that take longer to transfer heat, tile heats up quickly and distributes warmth into a room. It seamlessly contributes to the efficiency of an underfloor heating system by helping it deliver consistent comfort.
| Tile Feature | Heating Advantage |
| High Thermal Conductivity | Transfers heat quickly into the room |
| Low Thermal Resistance | Improves system efficiency |
| High Thermal Mass | Stores heat longer |
| Durability | Handles repeated heating cycles well |
| Easy Maintenance | Simple to clean and maintain |
Since both types of tiles have low thermal resistance and high conductivity, homeowners generally have high heating efficiency regardless of which type of tile is installed. Factors that have a greater impact on system performance include insulation, tile thickness, thermostat programming, and home heat loss.
What are the differences between ceramic and porcelain tiles?
Porcelain and ceramic tiles are both made from clay and fired in a kiln, though porcelain is denser, harder, and more water-resistant due to being made from more refined materials and being fired at higher temperatures.
While they are both from the same tile category, these differences in composition create differences in heating performance.
Porcelain Tiles
Porcelain tiles are made of lighter, refined clays that are blended with minerals such as quartz and feldspar, which are then fired at very high temperatures. The result is a denser tile composition that has lower porosity, contributing to its strong resistance to moisture absorption.
To qualify as porcelain, a tile must demonstrate a water absorption rate of 0.5% or less under ASTM C373 testing standards.
Ceramic Tiles
Ceramic tiles are typically darker, easier to cut, and less expensive to purchase. They are frequently used during residential installations where water resistance is helpful but not an essential priority.
| Feature | Ceramic Tile | Porcelain Tile |
| Water Absorption | Above 0.5% | ≤ 0.5% |
| Density | Moderate | High |
| Durability | Good | Excellent |
| Cost | Lower | Higher |
| Ease of Cutting | Easier | More Difficult |
| Outdoor Use | Not Recommended | Suitable |
| Bathroom/Wet Rooms | Good | Excellent |
Should you use electric or hydronic floor heating beneath the tile?
Both electric and hydronic radiant floor heating systems perform well beneath ceramic and porcelain tiles, though the choice of system depends on the project type.
Electric Radiant Heating
Electric radiant heating systems are typically used during renovations, as they are installed directly beneath the tile with little impact on raising the floor height. The system heats the floor upwards, allowing the tile to warm and then radiate heat throughout the rest of the space. Electric systems are a great option for entire home-heating projects or individual rooms, such as bathrooms and kitchens.
The StickyMat System, for instance, features an ultra-thin 1/8” heating cable that is pre-set in mesh, ensuring even cable spacing and delivering consistent heat with no cold spots.
Another great option is the DCM-PRO Uncoupling System, which helps protect the floor finish from subfloor movement while providing evenly-spaced high-heat output.
Hydronic Radiant Heating
Hydronic radiant heating systems are similarly installed beneath the floor and heat upwards, though they circulate warm water through a tubing system instead of using electricity. They are typically used for larger areas or whole-home heating installations. Due to the tubing materials needed during installation, they are easier to incorporate during a new build.
What factors impact porcelain and ceramic tile heat-up times?
Both porcelain and ceramic tiles heat up quickly, though the tile thickness has a greater impact on heat-up time than tile composition.
Heated tiled flooring is well-suited for warming spaces with high heat loss due to the low thermal resistance and high thermal mass of ceramic and porcelain. This allows heat to pass through easily into a room with little resistance. Heated tile floors typically take about 30-60 minutes to heat up, depending on the insulation used under the system. Once warmed up, tile will continue to release stored heat, helping maintain a comfortable floor and room temperature even after the heating system has been turned off. The thicker the tile, however, the more energy and time is required to heat up, since there is more material for the heat to pass through.
Placing proper insulation, such as the Ultralight Insulation Board, beneath the heating system can help improve heating performance by directing the heat upwards instead of allowing it to be absorbed into the subfloor. The Ultralight Insulation Board has a heat-spreading aluminum layer that reduces running costs and energy use during heat up by 30%, helping save up to $1 per square foot per year.
Is porcelain or ceramic better to use in bathrooms and wet rooms?
In moisture-prone spaces that require strong water resistance and durability – such as bathrooms, wet rooms, and laundry rooms – porcelain tiles are a better choice than ceramic, as they absorb significantly less water.
As part of PTCA guidelines, ASTM C373, porcelain tiles must have a water absorption rate of 0.5% or less to be considered porcelain. This is an exceptionally low absorption rate, meaning that porcelain successfully resists moisture infiltration, staining, and freeze-thaw damage much better than ceramic tile.
When using porcelain tiles in high-moisture spaces, using a silicone sealant helps increase the tiles’ waterproofing capabilities. Additionally, using a Waterproofing Kit during heating system installation helps prevent water from seeping through the tiling onto the system below.
Bathrooms and wet rooms are a popular room choice for incorporating heated tile flooring, since radiant heating eliminates the cool sensation associated with tiles and reduces moisture buildup on tile flooring, improving their maintenance and longevity.
How can a heated floor protect tile flooring?
A heating system that uses an Uncoupling Membrane will help prevent tile cracking by providing a protective barrier between the subfloor and the floor finish that significantly reduces the impact of subfloor movement.
Homes naturally expand and contract as a result of fluctuations in temperature, seasonal changes, and moisture levels, which can affect porcelain and ceramic tile flooring. The DCM-PRO Uncoupling Membrane is designed to absorb this movement before it ever reaches the finished floor surface. It slides and stretches when there is expansion and self-heals by contracting when the distance shrinks, effectively taking the brunt of these structural shifts so that the tile flooring is not impacted.
Benefits of DCM-PRO Uncoupling Membrane
- Helps reduce tile cracking
- Absorbs subfloor movement
- Improves installation longevity
- Adds waterproofing protection in wet rooms
- Supports long-term heating system performance
Which tile should you choose for floor heating?
While both are great choices for high-performance heating purposes, porcelain tile is an ideal choice if greater levels of durability and water resistance are needed, while ceramic tile is a great budget-friendly option.
When used with underfloor heating, both tile finishes offer excellent heating results due to their significant heat storing and heat transfer capabilities. Choosing between one or the other comes down to other aspects of the project, such as water-resistance, installation, budget, and room-specific needs.
| Choose Ceramic Tile If You Want: | Choose Porcelain Tile If You Want: |
| Lower material costs | Maximum durability |
| Easier installation | Superior moisture resistance |
| Good value for most living spaces | The best option for bathrooms and wet rooms |
The best option ultimately depends on your project’s priorities. Ceramic tile offers excellent heat transfer, lasting comfort, and budget-friendly pricing, making it a great choice for many indoor residential spaces, while porcelain provides superior durability, moisture resistance, and long-term performance for bathrooms, wet rooms, and high-traffic areas. No matter which tile you choose, pairing it with an underfloor heating system can help create a warmer, more energy-efficient home.
If you’re planning a heated floor project, such as a renovation or new build, contact our team or request a free quote to find out which heating solution and flooring selection would be best. For additional guidance, explore our YouTube channel for installation videos, product demonstrations, and expert advice.
Frequently Asked Questions
Does porcelain tile conduct heat better than ceramic tile?
Both porcelain and ceramic tile conduct heat exceptionally well, making the difference in heat performance minimal between the two. Tile thickness and system design typically impact heating performance more.
Does porcelain or ceramic tile last longer?
Generally, porcelain lasts longer than ceramic tile due to its denser material composition and greater water resistance, allowing for greater longevity than ceramic tile. This makes porcelain a great choice for high traffic areas and bathrooms, where long-term durability is necessary.
Is porcelain or ceramic easier to install?
Ceramic tile is typically easier to install, since it is softer and easier to cut than porcelain. Due to its high density, porcelain usually requires specialized cutting tools, which can increase installation time.
How hot do heated tile floors get?
Porcelain and ceramic tile floors can be heated up to 104°F (40°C). A Warmup Thermostat will automatically cap the floor temperature based on the floor type selected during setup, so that the system can’t overheat and damage the tile.
Is there a maximum tile thickness for floor heating?
No, there is no maximum tile thickness for radiant floor heating. However, thicker tiles take longer to heat up because there is more material for the heat to pass through. For the most responsive heated floor, Warmup recommends using a tile no thicker than ¾”.
Can floor heating crack porcelain or ceramic tile?
No, a properly installed floor heating system will not crack porcelain or ceramic tile. Tile cracks are usually caused by subfloor movement or installation issues, such as using a rigid adhesive or not fully embedding the heating system in thinset or self-leveler. An uncoupling membrane, like the DCM-PRO, absorbs this movement before it reaches the tile, helping prevent cracks.
