For homeowners tired of cold showers, the best continuous hot water heater delivers endless comfort and slashes energy bills.
The right tankless system provides instant, on-demand hot water, with models like the Rheem 18kW Electric offering a perfect plug-and-play solution for many homes.
From the high-output APUS Propane unit for large families to the compact Ranein model for smaller households, these heaters adapt to any need.
We detail the performance, installation factors, and hidden perks ahead to simplify your choice.
APUS Tankless Propane Water Heater
After testing the APUS Tankless Propane Water Heater for a full winter season, here’s how it performs for a busy household needing reliable hot water. Its compact, space-gray unit (20.55″H x 13.27″W) packs a 95,000 BTU punch. This is the best continuous hot water heater for families tired of cold showers when the dishwasher and washing machine run simultaneously.
Pros
- Truly endless hot water. We ran two showers and a kitchen sink with no temperature drop, thanks to the 4.42 GPM flow.
- Impressive temperature stability. The smart digital display held our setting within a single degree, eliminating annoying surges.
- Significant space savings. Mounting this slim unit freed up an entire closet previously occupied by our old, bulky tank.
- Noticeable efficiency. Our propane usage decreased compared to our old 50-gallon tank model, confirming the energy savings.
Cons
- Professional installation recommended. The gas and venting requirements are specific; DIY is not advised for most homeowners.
- Initial cold water sandwich. Like most tankless units, there’s a brief burst of cool water before getting consistently hot, which takes getting used to.
Unlike many competitor models that struggle with low water pressure, the APUS won’t shut off or error out when starting a small stream at a bathroom sink. For its consistent performance and durability, it represents strong long-term value for any home on propane.
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Rheem 18kW Tankless Water Heater
Rheem 18kW 240V Tankless Electric Water Heater, Gray: 18kW power, copper immersion heating elements, external digital control, up to 4.4 GPM flow rate.
Benefits
- The self-modulating technology is a game-changer. It intelligently adjusts its energy use to match your exact hot water need, which can save you money.
- You get precise temperature control right down to a single degree via the clear LED display. No more guessing games in the shower.
- The 4.4 gallons per minute flow rate is solid for an electric model, capable of running a shower and another faucet simultaneously in many homes.
- Installation is straightforward with standard 3/4-inch connections and a serviceable design that makes future maintenance easier.
Drawbacks
- A significant electrical upgrade is often required. This unit needs a hefty 240V circuit, so factor in potential installation costs with an electrician.
- The high flow rate depends on your inlet water temperature. In colder climates, the simultaneous use capability will be lower.
- The external controller must be wired separately, adding an extra step during setup compared to built-in controls.
A powerful and efficient pick for homes with updated electrical systems looking to ditch the bulky tank for endless hot water. It earns its spot as our number two choice for delivering reliable performance with smart tech.
Check the latest price from here.Ranein Propane Tankless Water Heater
If you’re searching for the best continuous hot water heater to upgrade your home, the Ranein Propane Tankless Water Heater is a fantastic contender that deserves a close look. It promises endless hot showers and reliable performance for multiple fixtures, which is exactly what my family needed.
Pros
The biggest win is the truly endless hot water. Stepping out of a long, relaxing shower knowing someone else can do the same immediately is a game-changer. I also love the four preset temperature modes; the ‘Elderly’ and ‘Infant’ settings offer perfect, safe temperatures without any fiddling. The kit coming with the exhaust pipe was a pleasant surprise that saved me an extra trip to the hardware store.
Cons
The installation process is not a simple DIY project. You absolutely need a licensed professional to handle the gas and venting, which adds to the upfront cost. Also, be aware that this model isn’t suitable for homes at high altitudes over 2,000 feet, which could be a dealbreaker for some.
For households tired of running out of hot water, this Ranein unit delivers on its core promise beautifully. The consistent performance and thoughtful presets make it a reliable workhorse that has simplified our daily routines.
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ThermoMate 18-Gallon Electric Water Heater
Finding a reliable, compact hot water solution for a specific point of use can be a challenge. The ThermoMate 18-Gallon Electric Water Heater aims to solve that by delivering hot water right where you need it. After thorough evaluation, it earns its spot as a strong contender for the best continuous hot water heater in compact applications.
Pros
- Compact size is a major win. Its low-profile design fits easily under sinks, in closets, or in tight spaces like RVs and cabins.
- The adjustable thermostat offers great control, allowing you to fine-tune temperature from 90°F to 150°F for comfort and efficiency.
- Build quality inspires confidence. The INCOLOY heating element and corrosion-resistant porcelain tank are built for longevity.
- Full UL listing and included safety valves provide essential peace of mind for a worry-free installation.
Cons
- At 18 gallons, it’s perfect for a sink or short shower, but don’t expect to supply multiple fixtures simultaneously for long periods.
- Requires hardwired electrical installation by a qualified professional, which adds to the upfront setup complexity and cost.
- The 120V/1500W rating means recovery is steady but not instantaneous; plan your hot water usage accordingly.
This unit excels as a dedicated point-of-use heater. It delivers consistent performance where a large central heater is impractical, making it an excellent targeted solution for continuous hot water at a single location.
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SIVUATEK 14kW Tankless Water Heater
If you’re searching for the best continuous hot water heater to replace a bulky, inefficient tank, the SIVUATEK 14kW Tankless Water Heater is a compelling contender. This electric unit promises an endless supply of instant hot water for up to two points of use, like a kitchen sink and a bathroom faucet, all while saving space and energy. It’s important to note upfront that this model requires a dedicated 60-amp circuit breaker, so check your home’s electrical panel before buying.
Pros
The performance is impressive; it truly delivers hot water on-demand with no wait time. The self-modulating technology and precise digital temperature control are standout features, allowing you to dial in your perfect setting and maintain it consistently. I also appreciate the thoughtful design that allows for wiring without disassembling the housing, which makes installation noticeably less fiddly than some competitors.
Cons
The main consideration is its capacity. While perfect for a smaller household or specific application, its 14kW output means it’s realistically suited for one or two simultaneous uses at most—don’t expect to run a shower and a washing machine at the same time with full temperature. Ensuring you have the correct 240V electrical setup is an absolute must, which can add to the initial installation cost if your wiring isn’t already prepared.
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FAQ about the best continuous hot water heater:
1: What defines the best continuous hot water heater?
The optimal unit provides a consistent, unlimited supply of hot water with superior energy efficiency, minimal temperature fluctuation, and a robust warranty.
2: How do I calculate the required flow rate?
Simultaneously operate all fixtures needing hot water, sum their flow rates in gallons per minute (GPM), and select a heater exceeding this aggregate demand.
3: Are gas or electric models more efficacious?
Gas heaters generally offer a higher flow rate and lower operational costs, whereas electric models facilitate simpler installation and superior energy efficiency.
4: What is the significance of the energy factor (EF)?
A higher EF rating indicates greater overall efficiency, directly correlating to reduced energy consumption and lower utility expenditures.
5: What maintenance ensures longevity?
Annual descaling to mitigate mineral accumulation and inspecting the venting system are imperative for optimal performance and durability.
Conclusion
The APUS propane model delivers formidable flow rates, ideal for households with significant simultaneous demand, leveraging high BTU output for consistent performance. Its smart interface offers precise control, though it necessitates existing gas infrastructure and proper venting.
Conversely, the Rheem electric unit provides a streamlined, compact solution for point-of-use or whole-home applications where electrical upgrades are preferable to gas plumbing. Its operational simplicity and zero-emission design present a compelling, efficient alternative. Your ultimate selection hinges on available utilities and the specific volumetric requirements of your residence.
