FAQ: How Big Of A Water Heater Do I Need For Radiant Heat?

Can I use a water heater for radiant heat?

Use a Water Heater to Make Radiant Floor Heat Instead of a Boiler. Many people use a water heater instead of a boiler for radiant floor heat because it COSTS LESS. A hot water heater saves money when used in this way. A high quality water heater is more energy efficient and friendlier to the environment.

What size tankless water heater do I need for radiant heat?

Answer: You’ll need to raise the incoming water temperature from 40 degrees to 105. You’ll need to be able to heat at least 5.2 gallons of water. So you’ll need a tankless water heater that can produce at least a 60 degree rise in temperature at 5.2 gallons per minute.

How many Btus do I need for radiant floor heating?

A typical output of a residential hydronic radiant heating system is within 25-35 BTU per square foot, with 40 BTU being a rare occasion for older homes and buildings with poor insulation.

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How do I calculate BTU for radiant heat?

Subtract the supply water temperature from the return water temperature to find the system temperature change. To find the system delivered Btu, multiply the Btu constant of 500 x the estimated Pump GPM x the System Temperature Change.

What are the pros and cons of radiant heat?

Pros and Cons of Radiant Heat

  • Uniform heating. The biggest benefit of floor-heating systems is their ability to uniformly heat a room and floor.
  • No maintenance. Electric floor-heating systems do not require maintenance.
  • No noise.
  • Non-allergenic.
  • Energy efficient.
  • Easy to install.

Is Radiant Heat expensive to run?

Like any type of electric heat, radiant panels can be expensive to operate, but they can provide supplemental heating in some rooms or can provide heat to a home addition when extending the conventional heating system is impractical.

Can a tankless hot water heater heat whole house?

Even in a cold climate, these efficient units can provide both domestic hot water and whole-house heating. Tankless water heaters are a proven technology with a track record of many years for heating DHW (see “Installing On-Demand Water Heaters,” 2/06).

What is the downside of a tankless water heater?

The primary disadvantage of on demand or instant hot water heaters is the upfront cost. The smaller units that you often see won’t produce enough hot water to serve most households. They’ll only serve one faucet at a time—a problem if you want to shower while the dishwasher is running.

Can a tankless water heater fill a tub?

Please remember that tankless water heaters also come in different sizes, and you need to get a unit that will deliver a strong flow to the tub. A small tankless water heater can take a long time to fill a large tub. Whatever way you choose, at least now you’ll finally be able to relax in a nice, hot whirlpool tub.

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How many BTUs do I need to heat 1500 square feet?

A 1,500-square-foot home will require between 45,000 to 90,000 BTUs.

What is the best temperature for radiant floor heat?

Radiant floors should not exceed 85 degrees F at the surface. 85 degrees is our skin temperature, so anything warmer starts too feel too warm. Floor coverings other than stone or tile REQUIRE a maximum temperature below 85 F. Most people are very comfortable between 75-80 degrees F.

How long can a radiant heat loop be?

The important thing to remember is that most zones consist of multiple parallel “circuits” or “loops”, and a loop should be no longer than 400 ft. (300 ft. for ½ PEX tubing). This is because after the hot water travels through 400 ft.

How do you size radiant heat?

Measure the length and width of the room where you intend to install radiant heat. Multiply the room’s length times the width to calculate the room’s square footage.

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