How to Choose a New Water Heater

Choosing a new water heater is a bigger decision than most people realize. The right choice depends on your household size, fuel source, budget, and long-term energy goals. This guide walks you through every factor so you can make a confident, informed decision.

Step 1: Choose the Right Type

Traditional Tank Water Heater

Stores a large volume of hot water (30-80 gallons) and keeps it heated continuously. Simple, affordable upfront, and easy to install. The most common type in American homes.

• Best for: Most households, budget-conscious buyers, straightforward replacement
• Lifespan: 8-15 years
• Downside: Standby heat loss (energy used to keep water hot even when not in use)

Tankless Water Heater

Heats water on demand as it flows through the unit - no storage tank. Provides endless hot water and uses significantly less energy than tank models.

• Best for: Households that want endless hot water, long-term energy savings, or limited space
• Lifespan: 20+ years
• Downside: Higher upfront cost, may require electrical or gas line upgrades

Rheem 18kW Tankless Electric Water Heater - reliable, efficient, built to last 20+ years. Ideal for medium to large households.

Ranein Natural Gas Tankless Water Heater - 8.5 GPM, 190,000 BTU, whole-home hot water on demand.

Heat Pump Water Heater

Uses electricity to move heat from the surrounding air into the water rather than generating heat directly. Extremely energy efficient - uses up to 70% less electricity than a standard electric tank heater.

• Best for: Warm climates, garages or utility rooms with good airflow, households focused on energy savings
• Lifespan: 10-15 years
• Downside: Higher upfront cost, needs adequate space and ambient temperature above 40 degrees F

Step 2: Choose the Right Fuel Source

In most cases, stick with the same fuel type as your current heater to avoid costly infrastructure changes.

Step 3: Choose the Right Size

For Tank Water Heaters

Tank size is measured in gallons. A good rule of thumb:

For Tankless Water Heaters

Tankless heaters are sized by flow rate (gallons per minute, or GPM) and temperature rise. Calculate how many fixtures you might run simultaneously and choose a unit that can handle that flow rate.

• 1-2 fixtures at once: 6-8 GPM
• 3+ fixtures at once: 8-10+ GPM

Step 4: Check the Energy Factor

Look for the Energy Factor (EF) or Uniform Energy Factor (UEF) rating on the label. A higher number means more efficient. ENERGY STAR certified models meet strict efficiency standards and can save significantly on energy bills over time.

Step 5: Consider the Total Cost

Step 6: Plan for Maintenance

Whatever type you choose, plan for regular maintenance to maximize lifespan. For tank heaters, this means annual flushing and anode rod replacement every 2-3 years. For tankless heaters, annual descaling.

RV Water Heater Anode Rod 2-Pack - essential maintenance part for any new tank water heater.

Tankless Water Heater Flushing Kit - everything you need for annual tankless descaling maintenance.

Frost King Water Heater Insulation Blanket - reduce standby heat loss on your new tank heater and lower energy bills.

Quick Decision Guide

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