Condensing Vs Non Condensing Water Heater: Which One Should You Choose?

Oleh Miss Erma Johnston June 17, 2023 Post a Comment

As the world progresses towards renewable energy, homeowners are looking for ways to reduce their carbon footprint while still having access to hot water. Two types of water heaters that have emerged are condensing and non-condensing water heaters. But what is the difference between these two, and which one should you choose?

In this article, we will dive deep into the world of condensing vs non-condensing water heaters and provide you with all the information you need to make an informed decision.

What Are Condensing Water Heaters?

Condensing water heaters are high-efficiency units that use waste heat from flue gases to preheat the cold water entering the unit. They use a secondary heat exchanger to extract heat from the exhaust gases before they are released into the atmosphere. This process results in a cooler exhaust gas temperature and higher thermal efficiency.

What Are Non-Condensing Water Heaters?

Non-condensing water heaters are traditional water heaters that have been used for decades. These units are less efficient than condensing water heaters and do not have a secondary heat exchanger to extract heat from the exhaust gases. As a result, they release hotter exhaust gases into the atmosphere, which wastes energy.

Efficiency

One of the biggest advantages of condensing water heaters is their high efficiency. These units have an efficiency rating of up to 98%, which means that almost all the fuel used to heat the water is converted into usable heat. On the other hand, non-condensing water heaters have an efficiency rating of around 80%.

Installation

Condensing water heaters require a different installation process than non-condensing water heaters. They must be vented through a PVC pipe rather than a metal vent pipe. This can add to the cost of installation, but it also means that condensing water heaters can be installed in a wider variety of locations.

Maintenance

Condensing water heaters require more maintenance than non-condensing water heaters. Because they have a secondary heat exchanger, they are more prone to corrosion and require regular cleaning. Non-condensing water heaters are generally easier to maintain, but they may need to be flushed periodically to remove sediment buildup.

Size

Because condensing water heaters are more efficient, they can be smaller than non-condensing water heaters while still providing the same amount of hot water. This can be an advantage for homeowners with limited space.

Operating Costs

While condensing water heaters are more expensive to install, they can save homeowners money in the long run. Because they are so efficient, they use less energy to heat water, which means lower utility bills. Non-condensing water heaters are less expensive upfront, but they may cost more to operate over time.

Lifespan

Condensing water heaters typically have a longer lifespan than non-condensing water heaters. This is because they are made with higher-quality materials and are designed to withstand the corrosive effects of condensation. Non-condensing water heaters may last around 10-15 years, while condensing water heaters can last up to 20 years or more.

Environmental Impact

Condensing water heaters have a lower environmental impact than non-condensing water heaters. Their high efficiency means that they produce fewer greenhouse gas emissions, which is better for the environment. In addition, the cooler exhaust gases produced by condensing water heaters reduce the risk of air pollution.

Cost

Condensing water heaters are more expensive than non-condensing water heaters. However, the price difference has been decreasing in recent years as more manufacturers enter the market. In addition, homeowners may be eligible for rebates or tax incentives for installing a high-efficiency unit.

Noise Level

Condensing water heaters tend to be quieter than non-condensing water heaters. This is because they use a fan to push exhaust gases through the secondary heat exchanger, rather than relying on natural draft.

Hot Water Output

Both condensing and non-condensing water heaters can provide ample hot water for most households. However, if you have a large family or frequently use multiple hot water appliances at once, a condensing water heater may be a better choice as it can provide a higher flow rate.

Venting

Condensing water heaters require a PVC pipe for venting, while non-condensing water heaters use a metal vent pipe. PVC pipes are generally easier to install, but they may not be suitable for all installations.

Fuel Type

Condensing water heaters are available in both gas and electric models. Non-condensing water heaters are typically only available in gas models.

Safety Features

Both condensing and non-condensing water heaters have safety features such as a temperature and pressure relief valve. However, condensing water heaters also have a built-in condensate trap to prevent acidic condensation from entering the sewer system.

So which one should you choose – condensing or non-condensing water heater? Ultimately, the decision will depend on your specific needs and budget. Condensing water heaters are more efficient, environmentally friendly, and have a longer lifespan, but they are also more expensive to install and maintain. Non-condensing water heaters are less expensive upfront but may cost more to operate over time.

No matter which one you choose, make sure to work with a licensed professional to ensure that your water heater is installed correctly and safely.

Frequently Asked Questions

Q1: What is the difference between a condensing and non-condensing water heater?

A1: The main difference between the two is their efficiency. Condensing water heaters are more efficient than non-condensing water heaters because they use waste heat from flue gases to preheat the cold water entering the unit.

Q2: Which one is more expensive – condensing or non-condensing water heater?

A2: Condensing water heaters are more expensive upfront, but they can save homeowners money in the long run by using less energy to heat water.

Q3: Do I need a special vent for a condensing water heater?

A3: Yes, condensing water heaters require a PVC pipe for venting, while non-condensing water heaters use a metal vent pipe.

Q4: Can I install a condensing water heater myself?

A4: No, it is recommended that you hire a licensed professional to install your water heater to ensure that it is correctly and safely.

Q5: What is the lifespan of a condensing water heater?

A5: Condensing water heaters can last up to 20 years or more, compared to around 10-15 years for non-condensing water heaters.

Q6: Are condensing water heaters better for the environment?

A6: Yes, condensing water heaters have a lower environmental impact than non-condensing water heaters because they produce fewer greenhouse gas emissions.

Q7: Can I switch from a non-condensing to a condensing water heater?

A7: Yes, but keep in mind that the installation process may be different, and you may need to make changes to your venting system.

Q8: Which one is quieter – condensing or non-condensing water heater?

A8: Condensing water heaters tend to be quieter than non-condensing water heaters because they use a fan to push exhaust gases through the secondary heat exchanger.

Q9: How much hot water can a condensing water heater provide?

A9: Condensing water heaters can provide ample hot water for most households. However, if you have a large family or frequently use multiple hot water appliances at once, a condensing water heater may be a better choice as it can provide a higher flow rate.