The Rinnai RE199eN is a natural gas, non-condensing, outdoor tankless water heater designed for small to medium households. It delivers on-demand hot water while focusing on simplicity, reliability, and affordability compared to premium condensing models. Some of its features are:
- Max input: 199,000 BTU
- Efficiency (UEF): ~0.82
- Installation: Outdoor only
- Type: Non-condensing
- Size: Compact (~small suitcase)
This is a mid-range, practical tankless system, not the most efficient, but dependable and easier to install.
Key Features of Rinnai RE99eN
1. Continuous Hot Water Supply
Like all tankless systems, the RE199eN heats water only when needed, meaning:
- No storage tank
- No running out of hot water
- Better space efficiency
This makes Rinnai RE99eN Ideal for homes where multiple taps may run simultaneously.
2. Compact, Outdoor-Friendly Design
RinnaiRE99eN is lightweight (~42 lbs), wall-mounted and designed specifically for outdoor installation.
This makes it easier to install than indoor models and good for homes with limited indoor space, particularly when planned with professional water heater installation services.
3. Moderate Efficiency (Non-Condensing)
Its Uniform Energy Factor (UEF) is 0.82 (solid, but not top-tier).
Compared to condensing models, RinnaiRE99eN has:
- Lower upfront cost
- Slightly higher gas consumption over time
Trade-off: you save money upfront, lose some efficiency long-term. Many homeowners choose this model when looking for cost-effective tankless water heater installation options.
4. Recirculation & Smart Features
RinnaiRE99eN has recirculation capability and is Wi-Fi compatible (with add-ons). The recirculation capabilities enables faster hot water delivery (with recirc system) and wi-fi connectivity allows remote monitoring/control.
5. Strong Build & Longevity
Rinnai units are known for:
- Long lifespan (often 15–20 years with maintenance)
- Reliable components
- Good warranty support
Understanding RinnaiREeN’s Performance in Real Use
Heating Power
- 199,000 BTU output = high heating capacity
- Suitable for:
- 2–4 person households
- 2–3 simultaneous fixtures
This makes it a strong option for homeowners planning a full tankless water heater replacement.
Hot Water Delivery
Some of the users have reported:
- Slight delay (~10–15 seconds before hot water arrives)
- Consistent temperature once running
The delay is normal for tankless systems, especially without recirculation, so it’s probably something you would experience in any other tankless system as well.
Pros and Cons for RinnaiREeN Tankless Water Heater
Pros:
- Reliable and proven brand – Rinnai is one of the most trusted names in tankless systems.
- Lower upfront cost than condensing units – Non-condensing = cheaper purchase + simpler installation.
- Compact and space-saving – Great for outdoor mounting and tight spaces.
- Endless hot water – No tank = no capacity limits.
- Easier installation — Fewer venting and drainage requirements vs condensing units, especially when handled by a professional water heater installation team.
Cons:
Lower efficiency than condensing models
- UEF 0.82 vs ~0.90–0.98 for premium units can result in higher gas bills over time.
- Outdoor-only limitation – Not suitable if you need indoor installation
- Weather exposure may require protective placement
- Initial delay for hot water – Typically ~10–15 seconds (However, this can be improved with recirculation system)
- Relatively expensive – Tankless systems cost more upfront than storage heaters in general
Non-Condensing vs Condensing (Important Context)
| Feature | RE199eN (Non-Condensing) | Condensing Models |
| Efficiency | Moderate (0.82) | High (0.90–0.98) |
| Cost | Lower | Higher |
| Installation | Easier | More complex |
| Venting | Simpler | More strict |
| Long-term savings | Lower | Higher |
Leaky’s Rating: ⭐⭐⭐⭐☆ (4/5)
The Rinnai RE199eN is a solid, practical tankless water heater that prioritizes reliability and affordability over cutting-edge efficiency. It’s not the most advanced model, but it’s dependable, compact, and powerful enough for most homes.
If you are looking to install a tankless water heater in San Antonio, feel free to connect with Leaky’s.