Best Places to Buy a Tankless Water Heater in 2025

You can buy tankless water heaters at home improvement stores, online retailers like Amazon, or specialized plumbing supply shops for the best selection and prices.

Tankless water heaters provide endless hot water while saving energy and space. But where should you buy one? This guide covers top retailers, key buying factors, and expert tips for choosing the perfect model.

Find the best tankless water heater options online

Top Retailers for Tankless Water Heaters

1. Home Improvement Stores

Home Depot and Lowe’s offer wide selections with professional installation services. They carry major brands like:

  • Rheem
  • EcoSmart
  • Rinnai
  • Takagi

Advantages include hands-on product viewing and local support. Many stores offer replacement parts for future maintenance needs.

2. Online Marketplaces

Amazon and Wayfair provide competitive pricing and customer reviews. Look for:

  • Free shipping options
  • Extended warranties
  • Bundle deals with installation kits

Check if the seller is authorized to ensure valid manufacturer warranties.

3. Plumbing Supply Stores

Local plumbing suppliers offer:

  • Professional-grade models
  • Expert advice
  • Wholesale pricing for contractors

They often carry specialized valve kits and accessories.

Key Buying Considerations

Fuel Type

Electric Models

  • Lower upfront cost
  • Easier installation
  • Limited simultaneous use

Gas Models

  • Higher flow rates
  • Better for whole-house use
  • Require proper venting

Size and Capacity

Measure your household’s peak demand:

Household Size Recommended Flow Rate
1-2 people 3-4 GPM
3-4 people 5-7 GPM
5+ people 8+ GPM

Installation Factors

Professional vs. DIY

While some electric models are DIY-friendly, gas units typically require:

  • Gas line modifications
  • Venting installation
  • Permits and inspections

Location Considerations

Outdoor units need freeze protection in cold climates. Indoor units require proper venting and condensation management.

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Top Brands Comparison

Premium Brands

  • Rinnai: Industry leader with advanced recirculation tech
  • Navien: Condensing models with high efficiency

Budget Options

  • EcoSmart: Affordable electric models
  • Stiebel Eltron: Reliable German engineering

Cost Breakdown

Total investment includes:

  • Unit cost: $500-$2,500
  • Installation: $500-$2,000
  • Additional parts: $100-$500

Energy savings typically pay for the unit in 5-10 years.

Maintenance Requirements

Annual descaling is crucial, especially in hard water areas. Consider purchasing a descaling pump for easy maintenance.

For more information on specific models, check our guide to energy-efficient water heaters from the U.S. Department of Energy.

Joye
Joye

I am a mechanical engineer and love doing research on different home and outdoor heating options. When I am not working, I love spending time with my family and friends. I also enjoy blogging about my findings and helping others to find the best heating options for their needs.