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Why Using A Tankless Water Heater For Radiant Floor Heating Is A Good Idea

Note: This post may contain affiliate links. This means that at no cost to you, we may receive a small commission for made purchases.

If you’re planning to install radiant heating under the floors in your house, a tankless water heater could be an excellent choice.

More individuals are moving towards radiant underfloor floor heating for great reasons – there are various advantages.

For starters, a tankless heater for radiant floors can really help you out by saving money in terms of energy bills and maintenance work since they are efficient and made to last.

Second, you have a consistent and even flow of heat through your house, which means toasty floors and inviting spaces.

We understand that selecting a water heating system for your radiant floors might be difficult.

There is a wide variety of choices available that it can be difficult to choose which is appropriate for your house and, more importantly, what method fits with these systems.

As a result, this article will go through the benefits of tankless underfloor floor heating. We’ll examine the benefits and drawbacks of water heaters.

We’ll go over why using a tankless water heater for radiant underfloor heating is a good idea then you can use this information to make an educated judgement.

What Is Radiant Floor Heating?

Underfloor heating, or radiant floor heating, is a type of heating. Unlike traditional radiator-based heating systems, underfloor heating is installed beneath the floor to evenly warm the whole space.

Water underfloor heating and electrical floor heating are the two types of radiant floor heating.

Water underfloor heating warms the space by pumping hot water out from the boiler through tubes.

Electric underfloor heating, on the other hand, achieves the same effect by sending energy through cables.

Warm-water radiant flooring is three times less expensive to run than electric radiant floors, but they cost more to install.

Which Is Better: Underfloor Heating Or Radiators?

Central heating methods are perhaps the most common type of heating.

Central heating functions by transferring warm water out from the boiler to the radiators. The radiator then radiates heat into the room, warming it up.

Radiators, however, have the drawback of making one region of the room hotter than another.

If the room gets chilly, you can either dial up the thermostat in the hopes that the heat will go further, use a plug-in electric heater, or add more layers of clothes.

Two of those alternatives will increase your energy expenditure, and all three are pretty inconvenient.

What Advantages Does Radiant Floor Heating Provide?

Underfloor Heating

Radiant floor heating has numerous advantages, including conserving space, money, and the environment. Check out our advantages here:

Space And Design

Radiant floor heating is installed beneath the floor and is virtually undetectable. This implies that the location of the radiator does not dictate your interior design.

You have a much greater creative flexibility when it comes to decorating and organising your furnishings.

Rooms will appear more spacious as a result, as well as attractive, modern, and sophisticated.

Flexible Use

Radiant floor heating can be placed in any type of property, upstairs or below, in new construction, additions, and renovations.

Install it in a single room or across the house; the choice is entirely yours.

Your needs drive radiant floor heating, not the other way round. It also works with most types of flooring, including wood, carpet, tiles, laminate, and vinyl.

High Efficiency

Radiant floor heating is 25% more efficient than warm-water radiant floor heating.

When combined with a pump, the system becomes 40 percent more efficient.

Radiant floor heating heats a room more efficiently while covering a wider area than radiators at a cooler temperature.

This is also excellent news for your utility bill. Your monthly payment will be reduced due to the lower amount of energy necessary to heat the room.

Environmentally Friendly

This leads us nicely to our next point: underfloor heating is also better for the environment because it is more energy efficient.

Implementing a radiant floor system will help you decrease your carbon footprint by reducing carbon emissions.


Unlike a radiator, there are no protrusions or very high temperatures that might cause injury.

Floors with heating below will not be excessively hot or unpleasant to stand on, even if it heats from the bottom up.

They will, however, make cool floors seem warm and wonderful to walk on, even first thing in the morning.


A smart thermostat (see also ‘Honeywell Vs Ecobee: Smart Thermostat Head To Head!‘) allows you to manage the temperature and set a heating plan. You won’t have to bother about turning it on manually every time you need to use it.

What Are The Disadvantages Of Radiant Floor Heating?

Radiant Floor Heating

Radiant floor heating, like any other product, has advantages and disadvantages.

And, while the advantages exceed the disadvantages, it’s important to address the disadvantages.

The majority of the disadvantages of radiant heated floors are related to the practicalities of installation rather than operation.

Initial Purchase Price

The price of radiant heated floors will vary depending on a variety of circumstances, but it will not be cheap.

Radiant floor heating, on the other hand, can add value to a home while also saving money on heating expenditures.

Cost Of Installation

Following the purchase of the underfloor heating system, you must consider the cost of installation.

It’s critical that it’s done properly by a licenced heating and plumbing contractor.

Smaller, simpler projects, on the other hand, may be able to save money by fitting the systems and tubing yourself.

Running Costs For Electricity

It’s hardly a deal-breaker, but electric heating systems (see also ‘6 Reasons To Consider Hydronic Baseboard Heaters‘) are more expensive to run than warm-water heating systems.

That’s why, rather than placing them throughout the house, it’s better to use them in smaller spaces like the bathroom.

Floor Level

If you’re renovating, you won’t have to dig up the flooring to insert radiant floor heating, but the level of the flooring will likely rise.

This rise could indicate that doors need to be sanded.

What Is A Tankless Water Heater?

Without using a storage water heater tank, tankless heaters heat up water straight away.

When turning a faucet on, cold water passes through an exchanger within the unit, and there it is heated using a natural gas burner or an electrical element.

Tankless heaters give a constant supply of hot water as a result. So, this means there’s no waiting for a hot water storage tank to refill.

However, the use of tankless water systems can actually limit the water flow rates.

Tankless heating systems (see also ‘Pros And Cons Of Hot Water Heating Systems‘) usually give out around 2–5 gallons of hot water each minute. Flow rates are higher with gas-fired water heaters than with electric ones.

Although, even larger, gas-fired models do not always give enough hot water output for excessive, multiple usages in large-family houses.

Running a bath and operating the washing machine simultaneously, for example, might be difficult for a tankless heating system.

You can choose to resolve this issue by purchasing multiple separate tankless heaters.

You could also add extra tankless heaters for certain appliances that utilise lots of water in the home, such as a washing machine or a dishwasher.

Extra water heating systems, however, would be more expensive but may be worthwhile depending on your setup.

Advantages And Disadvantages Of Tankless Water Heaters


A tankless water heater costs more up front than a traditional storage heater, but they have better longevity and have lower overall energy costs, which may offset the higher purchase price.

The majority of heating systems have a lifespan of over 20 years.

They also have readily changeable parts that can potentially extend its lifespan by several years.

Storage water heaters, on the other hand, endure 10–15 years.

Energy Efficiency

Demand water heaters can save up to 34% more energy than traditional storage tank heaters in houses that consume less than 41 gallons of hot water each day.

For homes that utilise lots of hot water – roughly 86 gallons per day – they can save 8–14 percent on energy.

In some circumstances, installing a demand heater at every hot water outlet may result in even higher energy savings.

Standby Energy

The idle energy loss involved with storage heaters are avoided with tankless water heaters.

While gas-fired water heaters have a better flow rate than electric ones, if they also have a pilot light, they can waste energy.

When contrasted to a storage heater, sometimes it can offset the removal of standby energy waste.

The pilot light of a gas-fired storage heater warms the water from the reservoir, saving energy.

Why Should You Use A Tankless Water Heater For Radiant Floor Heating?

Tankless Water Heater

The boiler is the most frequent means of heating, and it is still used in some older homes.

However, because much of the energy generated leaks through the ducts, it can be a very expensive technique of heating the home.

A tankless system saves electricity, which is a significant benefit. You may not need to raise your energy consumption if you use a tankless system for radiant floor heating.

Tankless heating systems, unlike some other heaters, generate just the quantity of heat that is required.

And it supplies the energy needed to keep the temperature at the correct level. The energy is directly used to heat the water.

Tankless heating systems heat water when it is needed, using an environmentally sustainable gas burner that controls the energy, which is accurately adjusted by the heater’s monitors based on demand, ensuring that the water isn’t ever overheated or underheated.

Tankless water heaters cut the high expenses of water heating that are associated with other outdated systems in half.

The hot water going through into the piping is always clean and free of sediment, allowing the system to endure longer and work consistently for many years. For most homeowners, this is a huge relief.

Installing And Maintaining A Tankless Heating System

Your water heater’s energy efficiency can be increased substantially by properly installing and maintaining the heater.

Lots of different factors lead to proper installation. These factors involve type of fuel, weather, local building standards, and safety considerations – particularly with regard to gas powered heater processes.

Because of this, having a certified heating and plumbing expert install your tankless water heater is recommended.

When you choose a professional to carry out your work, remember the following tips:

  • Request written cost estimates.
  • Request references.
  • Check out whether the company will secure an area permit and is knowledgeable about regional building codes.
  • If you insist on installing a heater manually by yourself, contact the manufacturer before you start. The correct setup and instructions are usually available through the manufacturer.
  • Check for information online or by contacting your local building department on obtaining a permit and regional heater installation codes, if applicable.

Hot water system upkeep can considerably increase the longevity of your tankless heater and greatly improve its efficiency.

Advice about installation and maintenance can be located in your owner’s manual, online, or by contacting the manufacturer.

Additional Energy-Saving Strategies

Try these additional energy-saving strategies to assist cut your water heating bills when a tankless heater is properly built and maintained.

Installing some energy-saving gadgets and systems with the hot water system is more cost-effective.

Install Low-Flow Faucets, Showerheads, And Other Fixtures

Simply fixing leaks in fixtures (such as faucets and showerheads) or pipes can drastically reduce hot water consumption.

A one-second leak loses 1,661 gallons and thus can cost more than $35 annually. If your hot water system tank is leaking, you’ll need to replace it.

Purchase Energy-Saving Dishwashing And Laundry Machines

The energy used to heat the water is the most expensive part of cleaning dishes and clothes.

If you buy and use an energy-efficient dishwasher and clothes washer, you’ll save a lot of money on energy.

Final Thoughts

Finally, using tankless heating systems for radiant floor heating makes a lot of financial sense. Tankless water heaters are capable of simultaneously heating the space and providing potable water.

Over time, the energy costs will be significant, and users will appreciate enhanced convenience and overall quality with heat evenly dispersed throughout a home.

author avatar
Charlie Hardcastle


On Key

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