Note: This article contains affiliate links. If you click on these links and make a purchase, we may earn a small commission at no extra cost to you. This helps support our research and content. Read our full affiliate disclosure here.
If you want on-demand hot water without the extra plumbing and condensation management of high-efficiency units, a non condensing tankless water heater can be a practical choice. These units typically use simpler venting, have fewer condensate-handling requirements, and can be easier to install in some homes. Choosing the right model affects flow performance, fuel efficiency, and long-term service needs, so selecting a unit that matches your household demand and venting constraints matters. This guide shortlists the top non condensing tankless water heaters and explains the key performance and installation tradeoffs we considered. Below you will find practical criteria and supporting information to help you pick a unit that meets your hot-water needs and installation limits.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | Rinnai V53DeP Propane Tankless Heater |  |
| Best Quality Built to a higher standard if you want something more solid | Rheem RTG Series RTG-95DVLP-3 |  |
| Best Value The sweet spot between price and what you get | GASLAND Gasmart E CE686NG |  |
| Best Budget The cheapest option that still gets the job done reliably | APUS Tankless Propane Water Heater |  |
| Top Rated A top-rated pick with lots of positive feedback | Titan N-120 Tankless Water Heater |  |
| Most Popular A crowd favorite that many people choose with confidence | EcoSmart ECO 11 Tankless Water Heater |  |
| Best Seller A high-volume bestseller chosen again and again | Orbek RV Tankless Water Heater HRU-RG060-A1 |  |
Rinnai V53DeP Propane Tankless Heater
| Power Source | Gas Powered |
|---|---|
| Flow Rate | 5.3 gpm |
| Mount Type | Wall |
| Material Type | Stainless Steel |
| Special Features | Wi-Fi Capable, Enhanced Scale Detection |
The Rinnai V53DeP is a wall-mounted propane tankless water heater built to provide continuous hot water for typical family needs without a storage tank. It heats on demand at up to 5.3 GPM, so it can support multiple fixtures (showers and a sink) running at once in many homes, and the stainless steel construction and enhanced scale detection aim to improve long-term reliability. The unit is designed for outdoor installation and is relatively compact, freeing up indoor space compared with tank systems. It is Wi-Fi capable with an optional module, which lets you monitor and manage the heater remotely, and Rinnai backs the product with a long heat-exchanger warranty. Expect professional installation for safe gas and venting hookups and to realize rated performance; flow will drop if multiple high-demand fixtures run simultaneously or in colder inlet-water conditions. As a non-condensing tankless model, it is simpler in design but less efficient than condensing units in some climates, yet it still offers solid energy savings over traditional tanks for balanced, all-around buyers.
Best for: Buyers who want a reliable, space-saving propane tankless heater that provides steady hot water for everyday household use and who value durability and easy remote monitoring.
Less Ideal for: Homes seeking the highest possible tankless efficiency or those in very cold climates where condensing models may deliver better seasonal savings should consider other options.
- Delivers up to 5.3 gallons per minute of continuous hot water suitable for multiple fixtures
- Compact wall-mounted design saves indoor space compared with tank water heaters
- Enhanced scale detection and stainless steel construction improve durability
- Wi‑Fi capable for remote monitoring when used with the optional module
- Backed by a long residential heat-exchanger warranty
- Non-condensing design is less energy efficient than condensing tankless units in some situations
- Requires professional gas and installation work to meet safety and performance expectations
Verdict: A compact, durable propane tankless heater that reliably delivers on-demand hot water for balanced household needs with convenient remote monitoring potential.
Rheem RTG Series RTG-95DVLP-3
| Flow Rate | 9.5 gpm |
|---|---|
| Maximum Temperature | 140 °F |
| Heat Output | 199900 british thermal units |
| Power Source | ac_dc |
| Wattage | 132 watts |
The Rheem RTG-95DVLP-3 is a high-performance indoor non-condensing tankless water heater designed for whole-house use. It produces up to 9.5 gallons per minute and 199,900 BTU/hr, which supports multiple simultaneous showers or high-demand fixtures without the lag of a storage tank. Key features that matter for performance buyers include Hot Start Programming to minimize cold-water bursts, an integrated digital display for precise temperature control, and LeakGuard leak detection for added protection. The unit is compact and wall-mounted to save space and offers universal venting compatibility for flexible installation. As a non-condensing model it achieves strong output and simpler venting but does not capture condensing-stage efficiency gains, so it trades slightly lower energy recovery for installation simplicity and durability. Expect professional installation for gas and venting work and routine maintenance on the heat exchanger to preserve peak performance over its long-rated life.
Best for: Buyers who prioritize strong, on-demand hot water and reliable high-output performance for multi-bath homes and heavy simultaneous use.
Less Ideal for: Homeowners seeking maximum energy savings from condensing units or those who want the highest UEF available should consider condensing alternatives.
- High maximum flow of 9.5 GPM suitable for 3–4 simultaneous showers
- 199,900 BTU/hr output for strong, consistent hot water delivery
- Hot Start Programming reduces cold-water bursts during back-to-back uses
- Integrated digital display allows precise temperature control
- Compact wall-mount design frees floor space and eases replacement of tank units
- Non-condensing design is less energy efficient than condensing models
- Professional installation required for gas hookup and venting
Verdict: Choose the RTG-95DVLP-3 if you need a robust, high-output non-condensing propane tankless heater that delivers reliable multi-fixture performance with simple venting.
GASLAND Gasmart E CE686NG
| Power Source | Natural Gas |
|---|---|
| Flow Rate | 7.6 gpm |
| Heat Output | 199000 british thermal units |
| Maximum Temperature | 140 °F |
| Maximum Pressure | 150 psi |
The GASLAND Gasmart E CE686NG is a high‑output indoor tankless natural gas water heater built to deliver continuous hot water for multiple fixtures. It is typically wall mounted in a utility closet or basement and sized for whole‑house use where higher flow and recovery matter. Notable features include a 199,000 BTU burner, 7.6 gpm maximum flow, CSA certification, and multiple safety protections such as freeze, flame‑failure, dry‑combustion, and high‑pressure safeguards plus an integrated error code indicator. In practice this model provides strong hot‑water volume for overlapping showers, laundry, and dishwasher use while saving space compared with tanks and offering higher long‑term reliability. Installation requires proper gas and venting infrastructure and likely a professional hookup given the 3/4" gas inlet and high BTU output. The unit trades compact size for the need for correct gas sizing and venting clearance, and its performance will depend on incoming cold‑water temperature and house plumbing layout, so buyers should verify flow requirements and installation constraints before choosing this non‑condensing option.
Best for: Buyers who want a space‑saving, high‑capacity tankless heater to reliably serve multiple bathrooms and appliances and who prioritize continuous hot water and long service life.
Less Ideal for: People with limited gas supply, inadequate venting options, or who prefer the extra efficiency of condensing units should consider alternatives.
- High heat output (199,000 BTU) supports whole‑house demand and overlapping fixtures
- 7.6 gpm maximum flow rate for strong simultaneous hot water delivery
- Multiple built‑in safety protections including anti‑freezing and flame failure
- Compact wall‑mounted design saves floor space compared with tank systems
- Non‑condensing design requires appropriate venting and does not reclaim flue heat
- High BTU input needs correct gas supply sizing and professional installation
Verdict: Choose this unit when you need a compact, high‑output non‑condensing tankless heater capable of serving whole‑house hot water demand reliably.
APUS Tankless Propane Water Heater
| Power Source | Liquid Propane |
|---|---|
| Flow Rate | 4.42 gpm |
| Maximum Temperature | 140 °F |
| Heat Output | 95,000 BTU |
| Voltage | 120 volts |
The APUS propane tankless water heater is a high-capacity, on-demand unit designed for indoor wall installation that supplies hot water for multiple fixtures without a storage tank. It heats up to 95,000 BTU and supports flow rates up to 4.42 GPM while its low-flow start at 0.66 GPM lets small draws trigger the unit. The LED touchscreen and smart CPU keep set temperatures steady (adjustable 95°F–140°F) and built-in protections handle flame failure, dry combustion, overheat, and freeze risk. The manufacturer highlights an oxygen-free copper heat exchanger and segmented combustion for claimed thermal efficiency and a UEF of 0.81, which should lower operating costs versus tank models. Practical limits include the 4.42 GPM ceiling that may not sustain three full showers simultaneously in colder climates and the requirement to drain the unit if left unused near freezing to avoid damage. Installation requires a 120 V AC electrical connection and appropriate propane gas and venting, so plan for professional hookup.
Best for: Buyers seeking a budget-conscious, high-output non-condensing tankless propane heater for indoor installation who prioritize steady temperature control and energy savings over ultra-high simultaneous flow rates.
Less Ideal for: Homes that need very high simultaneous hot-water flow in cold climates or users who cannot provide proper gas venting and professional installation should consider other solutions.
- High heating output at 95,000 BTU for strong temperature rise
- 0.66 GPM low-flow start so small hot-water draws activate the unit
- Digital LED display and smart CPU maintain steady set temperatures
- Multiple safety protections including flame failure, dry combustion, overheat, and anti-freeze features
- 4.42 GPM maximum flow may be marginal for simultaneous high-demand uses in cold inlet water conditions
- Requires proper propane hookup and venting plus occasional draining if exposed to freezing conditions
Verdict: A cost-conscious choice for buyers who want a powerful, non-condensing propane tankless heater that delivers steady temperatures and good efficiency for typical two-fixture hot-water demand.
Titan N-120 Tankless Water Heater
| Power Source | Corded Electric |
|---|---|
| Wattage | 11800 watts |
| Voltage | 220 volts |
| Mount Type | Wall |
| Special Features | Dual heating chambers, on-demand water control |
The Titan N-120 is a compact electric tankless unit intended for indoor wall mounting that supplies hot water on demand using dual heating chambers. It runs on 220 volts and up to 11,800 watts with a reported 54 max amps, which makes it suitable for continuous point-of-use or limited whole-home applications depending on plumbing and electrical setup. Notable features include a titanium heating material and on-demand water control that reduce standby losses and improve longevity compared with tank systems. Installation requires a dedicated 220V circuit and appropriate amperage, so expect higher electrical demands and possible need for an electrician in many homes. The slim footprint helps in tight utility spaces, but output will depend on incoming water temperature and flow, so performance may be limited in very cold climates or high simultaneous-use scenarios. For buyers focused on durability and straightforward on-demand performance, the N-120 is a reliable, no-frills electric option, though it is not a substitute for high-capacity gas models where very high flow rates are required.
Best for: Buyers who prioritize a durable, low-maintenance electric tankless heater for reliable on-demand hot water and who can accommodate a dedicated high-voltage electrical connection.
Less Ideal for: Homes that need very high flow rates for multiple simultaneous fixtures or installations without access to a 220V high-amp circuit should consider alternative high-capacity or gas-fired solutions.
- Compact wall-mounted design fits tight utility spaces
- Titanium heating material for corrosion resistance and durability
- On-demand dual heating chambers reduce standby energy loss
- High wattage (11,800 W) suitable for steady hot water delivery at moderate flows
- Requires a dedicated 220V, high-amp electrical circuit which can increase installation cost
- Output is limited by incoming water temperature and may struggle with high simultaneous demand
Verdict: A robust, compact electric tankless heater built for dependable on-demand hot water where a dedicated 220V circuit is available.
EcoSmart ECO 11 Tankless Water Heater
| Heat Output | 11 KW |
|---|---|
| Wattage | 13000 watts |
| Voltage | 220 volts |
| Flow Rate | 3.1 gpm |
| Maximum Temperature | 140 °F |
The EcoSmart ECO 11 is a 13 kW, wall-mounted electric tankless heater built for point-of-use tasks like a single shower, a sink, or a small office breakroom. It heats water as it flows through the unit using self-modulating technology that adjusts power to meet the set temperature, and an LED digital control lets you dial temperature to the degree. The unit claims up to about 3.1 gpm depending on inlet temperature, so it performs well in warmer climates or for low-flow fixtures; in colder climates it is best used as a sink or single-shower solution. Installation requires a dedicated 240 V circuit and substantial amperage, so plan electrical work accordingly. The compact wall mount saves space compared with tank heaters, and the manufacturer backs core components with a lifetime electronics and element warranty. Expect reliable, energy-efficient on-demand hot water at point-of-use, but check sizing and electrical capacity before buying since it is not intended to replace a whole-house system in cold climates.
Best for: Buyers who want a reliable, compact electric tankless unit for a bathroom, kitchen sink, or office point-of-use and who prioritize consistent on-demand hot water with energy efficiency and manufacturer-backed components.
Less Ideal for: Homes seeking a cold-climate whole-house solution or buyers who cannot accommodate the required dedicated high-amperage electrical circuit should consider larger or different systems.
- Compact wall-mounted design saves floor space and fits at point-of-use locations
- Self-modulating electronics adjust power for steady temperature and higher efficiency
- Digital LED temperature control with 1-degree increments for precise settings
- Provides up to ~3.1 gpm, suitable for a single shower and sinks in warmer inlet conditions
- Lifetime warranty on electronics, exchanger, and element for long-term coverage of core parts
- Limited flow rate makes it unsuitable as a whole-house heater in cold climates
- Requires a dedicated high-amperage 240 V circuit which can increase installation cost
Verdict: A compact, energy-efficient point-of-use electric tankless heater that reliably delivers on-demand hot water for single-fixture use when correctly sized and electrically supported.
Orbek RV Tankless Water Heater HRU-RG060-A1
| Power Source | Liquid Propane |
|---|---|
| Voltage | 12 volts DC |
| Flow Rate | 3.5 gpm |
| Maximum Temperature | 123 °F |
| Mount Type | Door Mount |
The Orbek RV tankless heater is built for RV use, supplying continuous hot water on demand for showers, dishwashing, and other onboard needs while running from a 12V DC supply and liquid propane. It uses a 60,000 BTU burner with oxygen-free copper heat exchangers and a brushless DC fan to maintain flow rates up to 3.5 gpm and sustain performance at higher elevations through a high-altitude mode. A smart remote lets you set water temperature between 95°F and 123°F and read error codes, and the unit includes safety features like flame failure protection, dry combustion protection, and anti-freeze functions. Installation is intended to match standard RV door openings and uses common NPT connections, and the unit ships with a remote and a built-in 150 psi pressure-reducing valve to simplify setup. Limitations to note are the 12V power requirement, which may need a converter in RVs without a true 12V source, and the heater is sized for RV applications rather than whole-house fixed installations.
Best for: Buyers who want a reliable, factory-quality tankless heater specifically for RV and camper use and prioritize continuous on-demand hot water with safety protections and high-altitude capability.
Less Ideal for: Not a good choice for homeowners seeking a whole-house, non-RV installation or for users who need very high combined flow for multiple fixtures at once.
- Continuous on-demand hot water with a 60,000 BTU burner for steady flow
- Designed for high-altitude operation using copper heat exchangers and a brushless DC fan
- Remote temperature control with 95°F–123°F range and diagnostic error codes
- Built-in safety features including flame failure protection, dry combustion protection, and anti-freeze protection
- Includes a 150 PSI pressure-reducing valve and standard RV connections to ease installation
- Requires a 12V DC power source or an AC-to-DC converter for RVs without 12V supply
- Flow rate (3.5 gpm) may be limiting for simultaneous multiple high-demand fixtures
Verdict: A purpose-built RV tankless heater that reliably delivers on-demand hot water with safety and high-altitude performance for travelers who need a factory-quality replacement.
Choosing the Right Non Condensing Tankless Water Heater: Key Factors to Consider
Flow Rate and Temperature Rise
Flow rate determines how many fixtures the unit can supply simultaneously and how well it maintains set temperatures when multiple taps run. For tankless units, manufacturers specify flow at particular temperature rises. You should estimate the expected inlet-to-outlet temperature difference in your climate and compare it to the unit's rated flow at that rise.
A higher flow rating at the same temperature rise means the unit can serve more showers or a shower plus a dishwasher without noticeable cooling. Undersizing leads to low flow or fluctuating temperatures. When sizing, consider peak simultaneous demand rather than just typical use, and allow a margin for colder incoming water in winter.
Venting Type and Complexity
Non condensing tankless water heaters generally use combustion venting that avoids condensate management, but vent material, length, and termination rules still vary. Some units accept standard metal or PVC vents while others require specific material or slope for proper draft.
Venting complexity affects installation cost and placement options. Short, straight vent runs into an exterior wall are simplest. Long or offset runs, chimney conversions, or tight rooftop terminations may necessitate additional parts or professional labor. Confirm clearances, vent termination locations, and whether power venting or mechanical exhaust is needed.
Fuel Type and Efficiency
Fuel source—natural gas, propane, or electric—affects operating cost and installation constraints. Non condensing gas units often trade some efficiency for simpler venting. Check the unit's input rating and thermal efficiency to estimate energy use under typical loads.
Efficiency differences translate into operating cost over time, so match the unit to your fuel economics and expected run hours. Also review burner modulation and control logic, which influence how efficiently the unit scales output for low-demand situations and how often it cycles on and off.
Serviceability and Maintenance Needs
Ease of servicing impacts long-term reliability and cost. Non condensing models still need periodic maintenance such as scale and sediment checks, burner inspection, and gas valve diagnostics. Units with accessible panels, simple wiring layouts, and clear diagnostics save technician time.
Consider whether the unit has replaceable parts that are commonly serviced, and whether the drain and shutoff valves for scale flushing are straightforward to operate. Good service documentation and diagnostic error codes reduce troubleshooting time and expense.
Materials and Corrosion Resistance
Heat exchanger material and corrosion protection determine lifespan, especially in areas with aggressive water chemistry. Non condensing units often use stainless steel or copper heat exchangers. Look for corrosion-resistant coatings, sacrificial anode provisions, or serviceable components that can be replaced if needed.
A more robust heat exchanger and quality internal fittings reduce the chance of leaks and extend usable life. Consider local water hardness and whether a water-softening or pre-filtering solution is advisable to protect the unit.
Sizing a Non Condensing Tankless for Your Home
Sizing starts with listing peak simultaneous demands such as multiple showers, washing machines, and faucets. Convert each fixture to an estimated gallons-per-minute figure and add them to get the required peak flow. Then determine the expected inlet water temperature for your coldest months to calculate the required temperature rise.
Use the required flow and temperature rise to match a unit's rated performance. If your expected demand sits between two unit ratings, choose the higher capacity to avoid shortfalls. Also consider future changes like additional bathrooms or appliances.
- Estimate peak simultaneous GPM from fixtures
- Calculate temperature rise using local cold-water temperatures
- Match unit-rated GPM at that temperature rise
- Allow a safety margin for colder months or added fixtures
Common Venting Configurations and Considerations
Non condensing tankless units typically rely on category I, III, or IV venting approaches depending on model design, but the key buyer concern is whether the vent run fits your house. Exterior wall terminations with short runs are easiest and cheapest. Long runs, offsets, or vertical roof terminations increase complexity.
Check clearance requirements and whether the unit requires stainless steel or other specific vent materials. Also verify local code requirements for combustion air and termination placement to avoid backdrafting or safety issues.
- Short, straight exterior venting is preferred
- Long or offset runs may require elbows and support
- Confirm vent material and clearance requirements with local code
Installation Practicalities and Common Upgrades
Installation tasks that commonly add time include gas line upsizing, vent modifications, and adding dedicated electrical circuits for ignition or controls. Non condensing units avoid condensate drains, but you still need accessible shutoffs and service valves for routine flushing.
Homeowners should budget for the potential need to upgrade gas piping or install a new vent chase. If water quality is poor, pre-filtration or a water softener can reduce maintenance frequency and protect the heat exchanger.
- Plan for potential gas piping or venting upgrades
- Install isolation valves and flushing ports for maintenance
- Consider water treatment if incoming water is hard
Maintenance Best Practices
Routine maintenance keeps performance steady and prevents premature failure. Flush the heat exchanger at recommended intervals to remove scale if your water has mineral content. Inspect burners, pilot assemblies, and ignition components annually or per manufacturer guidance.
Keep vent terminations clear of debris and ensure combustion air is unobstructed. Document maintenance dates and any service actions so technicians can see a history during future visits.
- Schedule periodic heat exchanger flushes for scale control
- Inspect burners and ignition annually
- Keep vent terminations and combustion air paths clean
When to Call a Professional
Complex vent runs, gas line modifications, or adjustments to combustion air typically require a licensed technician. Altering venting type or installing on a different fuel source also needs code knowledge and proper permits.
If you notice unusual noises, repeated shutdowns, or persistent error codes after basic troubleshooting, contact a qualified service provider rather than attempting advanced repairs yourself.
- Hire a pro for gas or vent modifications
- Get professional diagnostics for recurring faults
- Ensure permits and inspections accompany major installation changes
How We Chose the Best Non Condensing Tankless Water Heater
We focused on attributes that matter most for homeowners choosing a non condensing tankless water heater. Our evaluation prioritized measurable supply performance and practical installation factors. Key criteria included rated flow rate at realistic temperature rises, venting type and sizing requirements, energy efficiency under typical loads, and reliability features such as burner design and serviceability. We also assessed build and material quality that affects long-term corrosion resistance, ease of maintenance including access to replaceable parts and diagnostics, and the clarity of installation and service documentation. Safety features and code-compatible vent termination options were considered as part of installation feasibility. Exclusions: we omitted condensing or hybrid models and any units that require mandatory condensate handling or special drain connections. These filters ensured the list focuses on straightforward, non-condensing designs that suit homes where simpler venting and lower upfront installation complexity are priorities. The scoring emphasized flow performance, venting/installation complexity, and durability because those dimensions most directly affect real-world satisfaction and cost of ownership.
Our full evaluation process is outlined in our review methodology.
FAQ
Are non condensing tankless water heaters less efficient than condensing models?
Generally they have lower thermal efficiency because they do not recover latent heat from flue gases. However, the simpler venting can reduce installation complexity and cost, which may be a deciding factor for some homes.
Do non condensing units require a condensate drain?
No. By definition, non condensing designs avoid producing condensate, so they do not need condensate drains. This simplifies placement and venting, but you still must follow clearance and termination rules.
How often should I flush a non condensing tankless water heater?
Frequency depends on water hardness and usage. In areas with hard water, an annual flush is common. Softer water or added pre-filtration can extend the interval. Follow manufacturer guidance for best results.
Can I install a non condensing tankless myself?
Some homeowners can handle basic mounting and water connections, but gas-line sizing, venting changes, and combustion-air arrangements usually require a licensed professional to meet code and ensure safe operation.
Will a non condensing unit handle two showers at once?
It depends on the unit's rated flow at the required temperature rise and the showers' flow rates. Match the unit's GPM at your expected winter temperature rise to the combined demand to determine if it can sustain two showers simultaneously.
Final Verdict
Non condensing tankless water heaters are a practical choice when you want on-demand hot water with simpler venting and fewer plumbing requirements. Prioritize correctly sizing the unit for peak simultaneous demand, and weigh venting constraints and local installation requirements when choosing placement. Balance flow capacity, venting complexity, and maintainability based on your home and water quality. If you focus on those tradeoffs, you can confidently select a non condensing unit that delivers reliable hot water and straightforward service over time.