In a condo, space is valuable, comfort matters, and energy efficiency is always a plus. Hot water is something you use every single day — for showers, dishwashing, and laundry — yet traditional water heaters take up a lot of room and store water you might not even use right away. A tankless water heater changes that by heating water only when you need it, saving space and potentially lowering your energy costs.
This guide starts with our top recommendations for the best tankless water heaters for condos in 2025, followed by a complete buying guide to help you choose the right model for your living space.
Top Tankless Water Heater Picks for Condos
1. Rinnai RU130iN Indoor Tankless Water Heater
The Rinnai RU130iN is a natural gas tankless water heater that delivers up to 7 gallons per minute (GPM), which is enough to run multiple fixtures at once. It is designed for indoor installation with direct venting, making it a great choice for condos with natural gas service.
- Best for: Larger condos with two or more bathrooms
- Pros: High flow rate, long-lasting build quality, energy-efficient
- Cons: Requires professional installation and venting
2. EcoSmart ECO 27 Electric Tankless Water Heater
The EcoSmart ECO 27 is a popular electric option for condos without gas service. It provides up to 6.5 GPM in warmer climates (less in colder regions) and has digital temperature control for precise adjustments. Its compact size makes it easy to fit into utility closets or under counters.
- Best for: All-electric condos
- Pros: Space-saving, adjustable temperature, easy to maintain
- Cons: Requires a high-amperage electrical panel
3. Stiebel Eltron Tempra Plus 24
The Stiebel Eltron Tempra Plus 24 is an advanced electric unit known for quiet operation and consistent temperature delivery. Its flow control technology adjusts water flow automatically to maintain your chosen temperature, even when multiple fixtures are in use.
- Best for: Condos where noise control is important
- Pros: Silent operation, sleek design, precise flow control
- Cons: Higher cost than basic electric units
4. Noritz NR66ODNG Outdoor Tankless Water Heater
If your condo allows outdoor installations, the Noritz NR66ODNG is a natural gas unit that frees up indoor space entirely. It delivers 6.6 GPM and has freeze protection, making it suitable for year-round use in most climates.
- Best for: Condos with an outdoor utility area
- Pros: Saves indoor space, high output, built for outdoor durability
- Cons: Requires approved outdoor installation space
5. Rheem RTEX-24 Electric Tankless Water Heater
The Rheem RTEX-24 offers a compact, budget-friendly electric solution for small to mid-size condos. It features copper immersion heating elements for quick hot water delivery and a simple digital thermostat for easy adjustments.
- Best for: One- or two-bathroom condos
- Pros: Affordable, quick installation, responsive heating
- Cons: Limited capacity for larger households
Why a Tankless Water Heater Is Ideal for Condo Living
Traditional water heaters store hot water in a large tank, taking up valuable floor space and constantly reheating the water to maintain temperature. In a condo, where every square foot matters, a tankless model offers clear benefits:
- Space-saving: Wall-mounted units free up floor space
- Energy-efficient: Heats water only when needed
- Continuous hot water: No running out mid-shower
- Reduced leak risk: No large tank of water that could burst
Key Factors to Consider Before Buying
Fuel Type
Condos with natural gas service can take advantage of powerful gas models. If your condo is all-electric, choose an electric model that fits your panel capacity.
Flow Rate (GPM)
Estimate your peak water use. A single-bath condo may need 3–4 GPM, while two-bath units might need 6–7 GPM to run multiple fixtures comfortably.
Installation Requirements
Gas units need venting, which may require building approval. Electric units need adequate breaker capacity. Always confirm with your condo association before buying.
Temperature Control
Digital temperature settings help maintain comfort and avoid scalding, especially when other fixtures are in use.
Noise Level
Some tankless heaters are very quiet, which is an advantage in condos where walls are close to living spaces.
Installation Tips for Condos
- Check building rules and HOA guidelines before installing
- Hire a licensed plumber or electrician to meet local codes
- Choose an installation spot with easy maintenance access
- For gas models, ensure proper venting and carbon monoxide safety
- For electric models, verify breaker panel capacity
Maintenance Tips
While tankless models require less maintenance than storage tanks, regular care helps them last longer:
- Flush the system annually to prevent scale buildup
- Clean inlet filters periodically
- Check connections for leaks
- Inspect venting for gas units
Conclusion
The best tankless water heater for your condo depends on your fuel source, space, and hot water needs. The Rinnai RU130iN is a strong choice for larger condos with gas service. The EcoSmart ECO 27 and Rheem RTEX-24 are reliable electric options. For the quietest performance, the Stiebel Eltron Tempra Plus 24 excels, while the Noritz NR66ODNG is ideal if you can install outdoors.
Choosing the right model will give you endless hot water, save space, and improve energy efficiency — all of which make condo living more comfortable and convenient.