Best Places to Buy a Tankless Water Heater in 2026
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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.
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.
Water Heater Owner's ToolkitFix the common faults yourself, keep it running for years, and know when a repair is money wasted.No-hot-water flowcharts, gas and electricFlush, anode, relief valve and descaling stepsRepair-or-replace calculator (Excel)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.
Related pick: Check price on Amazon
