You’re tired of lukewarm showers and endless waits for hot water. You know there has to be a better way. Understanding tank vs tankless water heaters is key to finding that perfect solution.
Choosing the right water heater is a big decision for your purchase price and operating costs. This guide helps you navigate the tank vs tankless debate to make the best choice for your home, considering both the initial cost and operating cost. We’ll break down everything in simple terms: cost, efficiency, and what’s best for your family’s water usage.
How Tank vs Tankless Water Heaters Work
Traditional tank storage water heaters heat gallons of water in a tank, keeping it hot and ready for use. This water heater type is common in many households. Tank storage is convenient for instant hot water access.
Tankless water heaters, also called on-demand water heaters or demand water heaters, heat water only when needed. These utilize storage tanks for your storage water. This works great with storage tank models and can give you plenty of storage water heater options.
Tank water heaters typically use gas or electricity to constantly heat the stored water, leading to standby energy loss even when not in use. On-demand water heaters only start heating when the hot water tap is turned on, rapidly heating water as it flows through the unit, thus eliminating standby heat loss.
Tank vs Tankless Water Heaters: Pros and Cons
Each type of hot water heater style has its advantages and drawbacks. Storage water heaters tend to come in tank storage models with varying capacities and are more likely to incur standby energy loss.
Tank Water Heaters
Pros
- Lower initial cost: Tank water heaters tend to be more budget-friendly upfront than tankless models. You can find tank water heaters for $300-$2,000, according to Consumer Reports.
- Easy installation: Tank water heaters are simple to install for licensed plumbers, especially as a replacement for an existing tank heater.
- Reliable hot water delivery for multiple uses: Tank models consistently provide hot water to multiple sources at once.
Cons
- Standby energy losses: Stored hot water gradually cools, resulting in standby energy losses, thus reducing the storage water heater’s energy efficiency.
- Limited hot water: Once the tank is depleted, you have to wait for it to refill and reheat, especially problematic with simultaneous showers or laundry.
- Shorter lifespan: Tank water heaters typically last 10-15 years before potentially needing costly replacements, sometimes sooner if consistently subjected to high hot water demand.
- Risk of leaks: Tank storage water heaters can develop leaks over time, causing potential water damage, and leading to water heater repair costs.
Tankless Water Heaters
Pros
- Unlimited hot water: Enjoy never running out of hot water with an on-demand tankless system, even during peak usage times. These electric tankless heaters deliver on-demand water and avoid water heater repair.
- Energy efficiency: Eliminating storage eliminates standby energy loss, improving the overall efficiency of your storage water heater. The U.S. Department of Energy suggests savings from 8% to 34%.
- Longer lifespan: Tankless water heaters often last 20+ years, double the lifespan of many traditional storage tank models.
- Space-saving: Compact tankless units save valuable floor space, especially beneficial for tight spaces like apartments. They eliminate the need for a large storage tank and standby energy losses from stored hot water, a bonus for hot water storage solutions in small areas.
Cons
- Higher initial cost: Tankless water heaters require a larger upfront investment ($1,150-$2,500 or more). The purchase price may depend on fuel type; for instance, natural gas tankless water heaters or electric tankless heaters have varying installation costs. Also, gas tankless water heaters or heat pump tankless models would require unique installations affecting cost.
- Complex installation: Installing a tankless model may require new gas lines or electrical upgrades, increasing the overall installation cost. This can make the electric heat installation more complex.
- Simultaneous use challenges: Though providing endless hot water, multiple simultaneous uses can sometimes strain a tankless system if not properly sized, especially impacting its flow rate. The flow rate would impact the water heating in case multiple uses overlap, which is why called on-demand water heaters or called on-demand water need careful sizing.
Sizing Tank vs Tankless Water Heaters
Tank Water Heaters
Tank water heaters are sized by storage capacity in gallons, usually ranging from 20 to 80 gallons. Larger storage tanks hold more water and provide hot water storage, better suited for high-demand households. These tanks allow continuous hot water storage, which causes standby energy loss due to water cooling.
A smaller tank (20-30 gallons) suits individuals or couples. Larger families or homes with higher water usage may require larger tanks to minimize running out of hot water, especially if multiple simultaneous hot water uses occur.
Tankless Water Heaters
Tankless water heaters are sized by flow rate, measured in gallons per minute (GPM). This typically ranges from 2 to 5 GPM. A good flow rate for simultaneous water usage needs careful consideration to maintain water heating speed.
Consider a higher flow rate for simultaneous uses and if your inlet water is very cold. A larger flow rate helps meet multiple simultaneous hot water demands.
A higher flow rate ensures enough hot water at a comfortable temperature, even with multiple uses like showers, appliances, and faucets running concurrently. This also compensates for very cold inlet water temperatures.
Choosing Between Tank and Tankless Water Heaters
Which is better, tank or tankless? It depends on individual circumstances.
A tank water heater suits budget-conscious homeowners with smaller households and moderate hot water needs. They’re easier to maintain and require lower upfront investments, especially suitable when electric heat installation cost is a major factor. The operating cost, specifically gas tankless water heaters cost may become relevant in the longer term.
Tankless water heaters excel in households with high hot water demand. These offer continuous hot water supply for extended periods, minimizing cold water interruptions. Although they have a higher initial installation cost, the purchase price is often offset by their increased energy efficiency over time.
If hot water is a priority and you value uninterrupted long showers, tankless makes sense. If a large tank can easily address your demand, that might save significant money up-front, which you may then consider reinvesting to achieve energy efficiency savings from potential tankless model alternatives that have a greater lifespan of up to twice as long for on-demand units.
Conclusion
Choosing between tank vs tankless water heaters involves balancing several factors like budget, household size, hot water usage, and energy efficiency. Energy.gov provides resources to help you with water heater selection and estimating costs.
Your choice affects both your monthly bills and daily comfort. This is because heaters tend to use energy sources differently. Therefore, the gas tankless water heaters cost varies from an electric heat pump installation, for instance. The storage tanks used in traditional water heaters typically generate higher standby energy losses.
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