Condensing Vs Non Condensing Tankless Water Heater: Which is better?

When it comes to choosing a tankless water heater, one of the most important decisions you'll make is whether to go with a condensing or non-condensing unit. Both options have their pros and cons, and finding the right one for your home can be overwhelming if you don't know what to look for.

In this article, we'll break down the differences between condensing and non-condensing tankless water heaters, and help you decide which one is right for you.

What is a tankless water heater?

Before we dive into the differences between condensing and non-condensing tankless water heaters, let's first define what a tankless water heater is.

A tankless water heater is a type of water heater that heats water on demand, rather than storing hot water in a tank. When you turn on a hot water tap, cold water flows through the tankless unit, where it is heated by a heating element or burner. The hot water then flows out of the faucet, providing you with instant hot water.

What is a condensing tankless water heater?

A condensing tankless water heater is a type of tankless water heater that recovers heat from the exhaust gases that are produced when the unit is heating water. This recovered heat is used to preheat the cold water that is flowing into the unit, which makes the unit more efficient.

Condensing tankless water heaters are able to achieve efficiencies of up to 98%, making them some of the most efficient water heaters on the market.

What is a non-condensing tankless water heater?

A non-condensing tankless water heater is a type of tankless water heater that does not recover heat from the exhaust gases. Instead, the exhaust gases are vented outside, and the unit heats the cold water as it flows through the unit.

Non-condensing tankless water heaters are generally less efficient than condensing units, with efficiencies ranging from 80% to 85%.

Differences between condensing and non-condensing tankless water heaters

The main difference between condensing and non-condensing tankless water heaters is their efficiency. Condensing units are able to recover heat from the exhaust gases, which makes them much more efficient than non-condensing units.

Aside from efficiency, there are a few other differences between these two types of tankless water heaters:

• Cost: Condensing units are generally more expensive than non-condensing units.
• Venting: Condensing units require special venting because they produce acidic condensate that can damage standard PVC pipes.
• Size: Condensing units are generally larger than non-condensing units because they have a secondary heat exchanger.

Pros and cons of condensing tankless water heaters

Pros:

• High efficiency
• Lower energy bills
• Reduced carbon footprint

Cons:

• Higher cost
• Special venting requirements
• Larger size

Pros and cons of non-condensing tankless water heaters

Pros:

• Lower cost
• Standard venting requirements
• Smaller size

Cons:

• Lower efficiency
• Higher energy bills
• Higher carbon footprint

Which one is right for you?

Choosing between a condensing and non-condensing tankless water heater ultimately comes down to your individual needs and preferences. Here are a few factors to consider when making your decision:

• Energy savings: If you're looking to save money on your energy bills and reduce your carbon footprint, a condensing tankless water heater is the way to go.
• Upfront cost: If you're on a tight budget, a non-condensing unit may be a better option.
• Space: If you don't have a lot of space for a water heater, a non-condensing unit may be a better option due to its smaller size.
• Venting: If you don't want to deal with special venting requirements, a non-condensing unit may be a better option.

Maintenance

Both condensing and non-condensing tankless water heaters require regular maintenance in order to operate efficiently. This includes flushing out mineral deposits and checking for any leaks or other issues.

It's important to follow the manufacturer's recommended maintenance schedule in order to keep your unit running smoothly and efficiently.

Choosing between a condensing and non-condensing tankless water heater can be a difficult decision, but ultimately it comes down to your individual needs and preferences. Consider factors such as energy savings, upfront cost, space, and venting requirements when making your decision.

No matter which type of tankless water heater you choose, remember that regular maintenance is key to keeping your unit running smoothly and efficiently.

Frequently Asked Questions

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

A1. The main difference is efficiency. Condensing units recover heat from exhaust gases, while non-condensing units do not.

Q2. Are condensing tankless water heaters more expensive than non-condensing units?

A2. Yes, condensing units are generally more expensive than non-condensing units.

Q3. Do condensing tankless water heaters require special venting?

A3. Yes, condensing units require special venting because they produce acidic condensate that can damage standard PVC pipes.

Q4. Are non-condensing tankless water heaters less efficient than condensing units?

A4. Yes, non-condensing units are generally less efficient than condensing units.

Q5. Which is better for the environment, a condensing or non-condensing tankless water heater?

A5. A condensing tankless water heater is better for the environment because it has a lower carbon footprint.

Q6. Do condensing tankless water heaters require more maintenance than non-condensing units?

A6. No, both types of units require regular maintenance in order to operate efficiently.

Q7. Are there any downsides to using a non-condensing tankless water heater?

A7. Yes, non-condensing units are generally less efficient and have a higher carbon footprint than condensing units.

Q8. Can I install a tankless water heater myself?

A8. It's recommended that you hire a professional to install your tankless water heater in order to ensure that it's installed correctly and safely.

Q9. How long do tankless water heaters last?

A9. Tankless water heaters typically last between 10 and 20 years.

Q10. Are tankless water heaters noisy?

A10. No, tankless water heaters are generally quieter than traditional tank water heaters.