Types of Water Heaters and How to Choose the Right One for Your Home

When the time comes to replace your old water heater, choosing the right replacement is essential for home comfort, energy efficiency, and long-term cost savings.

With various types of water heaters available, each offering distinct advantages and drawbacks, selecting the best option requires careful consideration. Roto-Rooter’s water heater comparison guide highlights conventional tank water heaters, tankless models, heat pumps, solar options, and condensing models, so you can learn what's out there. 

If you need more help, consider chatting with Roto-Rooter water heater experts. They can help you determine which model is right for your home and budget, taking into consideration your family’s water heating needs and energy usage expectations.

What Are the Different Types of Water Heaters?

Water heaters come in various designs, each suited for different household needs. Below are the most common types of hot water heaters.

Conventional Storage Tank Water Heaters

Storage tank water heaters are the most common type found in homes. These units store heated water in a tank, keeping it ready for use at all times. They typically range in size from 30 to 80 gallons.

• Benefits: Lower initial cost, simple installation, and widely available
• Drawbacks: Higher energy costs due to standby heat loss and requires space for a large tank
• Lifespan: 8-12 years

Tankless Water Heaters

Tankless water heaters heat water on demand rather than storing it. When you turn on a hot water tap, cold water flows through a heating element, providing hot water instantly. This reduces standby heat loss and provides continuous hot water when needed.

• Benefits: More energy-efficient, compact size saves space, provides endless hot water
• Drawbacks: Higher upfront cost, may struggle with high-demand households
• Lifespan: 15-20 years

Heat Pump (Hybrid) Water Heaters

Heat pump water heaters use ambient air to warm water, making them extremely energy-efficient. Instead of generating heat directly, they move heat from the surrounding air into the water, similar to how a refrigerator works but in reverse.

• Benefits: Lower operating costs, eco-friendly, highly efficient, and can save hundreds of dollars annually on energy bills
• Drawbacks: Higher initial cost, requires more space for installation and performs best in warm climates where there is ample surrounding heat
• Lifespan: 10-15 years

Solar Water Heaters

Solar water heaters collect energy from the sun to heat water. These systems use solar panels (collectors) to absorb sunlight and transfer the heat to a storage tank. They are most effective in sunny regions but may include backup heating elements for cloudy days.

• Benefits: Environmentally friendly, significantly lower operating costs, and reduces reliance on fossil fuels
• Drawbacks: High installation costs, performance depends on sunlight availability, and may require a conventional heater as a backup
• Lifespan: 15-20 years

Condensing Water Heaters

Condensing water heaters capture exhaust gases from natural gas systems and use them to heat water. These units are ideal for homes already using natural gas for heating. Instead of venting hot gases outside, they redirect them through a coil to preheat incoming water. They are more energy-efficient than conventional gas water heaters.

• Benefits: High energy efficiency, ideal for homes using natural gas, and reduces wasted heat
• Drawbacks: Requires a gas line, higher upfront cost, and may not be suitable for homes without an existing natural gas setup
• Lifespan: 10–15 years

Good, Better, and Best Water Heater Options for Your Home

Not all water heaters offer the same features, efficiency, or long-term value. Even within the same category, homeowners can choose between standard models, upgraded systems, and premium equipment with advanced technology.

Understanding these differences can help you find a water heater that meets your household's needs without paying for features you don't need.

Good: Standard Electric and Gas Water Heaters

Standard electric and gas storage water heaters are dependable options for homeowners who need reliable hot water without investing in premium equipment.

Conventional electric models use heating elements to warm water stored in an insulated tank. They're generally straightforward to maintain and can be a practical choice for homes without natural gas connections.

Standard gas models use natural gas or propane to heat stored water. They typically offer faster recovery rates than comparable conventional electric models, making them a popular option for households with regular hot water demands.

Consider a standard water heater if:

• You're replacing an existing tank-style system.
• You want to keep upfront replacement costs manageable.
• Your current water heater's capacity meets your household's needs.
• You prefer familiar technology with straightforward maintenance requirements.

Better: Upgraded Electric and Power Vent Gas Water Heaters

Homeowners looking for improved durability, performance, or installation flexibility may benefit from an upgraded water heater.

Preferred electric models may include enhanced tank protection, improved insulation, or components designed for longer service life. Features vary by manufacturer and model, so it's important to compare specifications and warranty coverage rather than relying on product labels alone.

For homes with natural gas connections, power vent water heaters are another option worth considering.

These systems use a fan-assisted exhaust system to move combustion gases outside the home. This provides greater flexibility in venting configurations, which can be beneficial when conventional venting isn't practical.

Some power vent models also offer improved energy efficiency compared with standard atmospheric-vent gas water heaters.

Consider an upgraded water heater if:

• You're interested in improved equipment durability or warranty coverage.
• You want better energy efficiency without necessarily switching to tankless technology.
• Your home's layout makes conventional gas venting difficult.
• You're planning to stay in your home and want to invest in long-term performance.

Best: Smart Hybrid and Tankless Water Heaters

For homeowners prioritizing energy efficiency, advanced features, and long-term performance, smart hybrid and tankless water heaters offer compelling advantages.

Smart hybrid water heaters combine heat pump technology with a conventional storage tank. Rather than relying entirely on electric resistance heating, they transfer heat from the surrounding air to warm the water.

Many premium hybrid models also offer Wi-Fi connectivity and smartphone controls, allowing homeowners to monitor energy consumption, adjust settings, and receive maintenance alerts.

Tankless water heaters take a different approach by heating water only when it's needed.

Unlike traditional storage systems, tankless units don't maintain a large reservoir of heated water. This helps reduce standby energy losses while providing continuous hot water within the system's rated capacity.

However, tankless systems must be properly sized for simultaneous household demand. A single undersized unit may struggle when multiple showers or appliances require hot water at once.

Both technologies generally involve higher upfront costs than standard storage water heaters, but their efficiency and performance benefits may make them worthwhile investments.

Consider a premium water heater if:

• Improving energy efficiency is a priority.
• You want smart monitoring and control features.
• You're interested in reducing long-term utility expenses.
• You have the budget for a more advanced system.
• Your household's hot water demands justify the upgrade.

Comparing Your Water Heater Options

Actual performance, efficiency, and installation costs depend on the specific equipment and your home's existing infrastructure.

How to Choose the Right Water Heater for Your Home

Selecting the right water heater depends on factors like household size, energy efficiency, and installation costs. Below are key considerations to help you decide between water heater options.

Household Size and Water Usage

Different households have varying hot water demands. For example, one study found that the average daily hot water consumption varies by household size:

• Homes with two occupants consumed an average of 44 gallons a day.
• Homes with three occupants consumed an average of 56 gallons a day.
• Homes with four occupants consumed an average of 68 gallons a day.
• Homes with five occupants consumed an average of 72 gallons a day.

With that in mind, a single-person household may only need a 30-gallon tank. Meanwhile, a family of four typically requires a 50-80-gallon tank or a high-flow-rate tankless system.

For tankless systems, you’ll need to calculate the peak usage flow rate to ensure it can handle simultaneous hot water demands. Do this by adding the flow rate — how many gallons per minute (GPMs) you use — for all of the hot water faucets in your house.

Smaller homes can typically get away with a system rated for 4-6 GPMs, but the average household needs a unit with 5-10 GPMs. Larger homes may need even bigger systems.

Energy Efficiency and Operating Costs

Energy-efficient models reduce long-term utility costs. Consider the following factors:

• Energy Factor (EF) and Uniform Energy Factor (UEF): These ratings measure a water heater’s efficiency. Higher numbers indicate greater efficiency. The EF rating accounts for overall energy use, while UEF provides a more accurate representation by considering real-world usage patterns. Look for models with ENERGY STAR certification for optimal efficiency.
• Fuel type: Gas water heaters typically cost less to operate than electric ones. On average, natural gas models cost around $338-$355 per year to run, while electric models can range from $613-$635. Solar water heaters have the lowest long-term costs but require a high initial investment.
• Rebates and incentives: Many federal and state programs offer rebates and tax credits for installing energy-efficient water heaters. For example, the U.S. federal government provides a tax credit of up to 30% of installation costs for ENERGY STAR-certified heat pump water heaters and solar water heating systems. Some utility companies also offer rebates for upgrading to efficient models.
• Smart units: A smart hot water heater can help you monitor the tank’s performance so you can save even more energy.

Installation and Maintenance Costs

Operating costs aren’t the only thing to consider. You also need to think about what it will cost to install and maintain your system.

• Installation:
• Gas heaters generally require venting systems and gas lines, which can increase installation costs. 
• Tankless water heaters may require upgrades to electrical or gas systems to accommodate their higher demand.
• Electric water heaters typically have lower installation costs, especially if you already have an electrical connection.
• Routine maintenance: 
• For traditional tank models, maintenance includes draining the water heater annually to remove sediment buildup, checking the anode rod to prevent corrosion, and inspecting the venting system for any blockages. 
• Tankless models require descaling to prevent mineral buildup that could obstruct the heating elements, especially in areas with hard water. 
• Heat pump and solar models may need regular checks of the compressor, filters, and solar panels to ensure optimal performance.

Local Climate and Energy Source

Local climate and available energy sources play a significant role in determining which type of water heater will be most effective and economical.

For example, if you live in a sunny climate like Florida or California, a solar water heater could be an excellent choice. However, this type of hot water heater would not work in cloudy locations like Pennsylvania or Washington.

Heat pump water heaters work best in warmer environments because they use ambient air to heat the water. They also tend to perform well in areas that do not experience freezing temperatures in the winter.

The energy source you have access to plays a crucial role in selecting your water heater. Gas heaters tend to be more affordable to operate. However, if you live in an area where electricity is more cost-effective or if you do not have a gas line, an electric water heater could be the better option.

FAQs 

What type of hot water heater is best?

A conventional tank water heater might be the best choice if you have a smaller budget, though it can be less energy-efficient due to standby heat loss. A tankless water heater offers higher energy efficiency and eliminates standby heat loss, but it costs more. On the other hand, a hybrid or heat pump water heater is ideal for warmer climates, offering long-term savings on energy bills.

What are the 3 types of water heaters?

The three main types of water heaters are tank, tankless, and hybrid models. Tank water heaters are the most common and work by storing hot water in a tank for immediate use. Tankless water heaters heat water on demand without the need for a storage tank. Hybrid water heaters extract heat from the surrounding air to warm the water.

Which is better, a tankless or hybrid water heater?

Tankless water heaters are better if you want endless hot water. They’re compact and energy-efficient, although they can struggle to meet high demand if multiple outlets are used simultaneously.

Hybrid water heaters, on the other hand, excel at energy efficiency and are perfect for households in warmer climates. However, they require more installation space and may not perform as well in colder areas.

Why avoid a tankless water heater?

One major drawback is their high upfront cost, which includes not only the price of the unit but also upgrades to plumbing or electrical systems. Additionally, tankless units may not be able to handle multiple hot water demands at the same time in larger households. For example, using a shower while the dishwasher runs might exceed the capacity of a tankless system.

Is it worth upgrading to a premium water heater?

A premium water heater may be worth the investment if you're looking for improved energy efficiency, advanced monitoring features, or specific performance benefits. Smart hybrid systems can help reduce electricity consumption, while properly sized tankless systems provide continuous hot water without storing it in a tank. However, a standard gas or electric water heater may be the more economical choice if your household has modest hot water demands. Compare installation costs, energy consumption, and equipment features before deciding.