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The Ranein 18kW Tankless Electric Water Heater offers strong performance for small to medium residential needs, particularly suitable for 2-3 usage points like showers or sinks. Its flow rate of up to 4.3 gallons per minute means it can provide a steady stream of hot water without delays, which is great if you want endless hot water on demand. The unit is compact, with dimensions around 14 by 19 inches, making it easy to install in tight spaces or wall-mounted. One of its biggest strengths is energy efficiency; it claims up to 99% thermal efficiency and can save about 60% on heating costs compared to traditional tank heaters, since it only heats water when needed. Temperature control is user-friendly with a knob and clear LED display, allowing adjustment in small 1°F steps, up to 131°F. This makes it flexible for family comfort and safety. On the safety side, it includes protections against leaks and overheating, which adds peace of mind.
However, it requires a 240V power supply and two 40-amp circuit breakers, so your home's electrical system must support this load, which could require professional installation or upgrades. While it handles moderate water needs well, the flow rate might be limiting for larger households with multiple simultaneous demands. The warranty and customer reviews indicate decent reliability, but its performance depends on correct sizing for your household. If you want a space-saving, efficient, and easy-to-use tankless water heater for a small to medium home setup, this model presents a solid choice.
The Stiebel Eltron Tempra 36 Plus is a high-powered tankless electric water heater designed to deliver continuous hot water on demand. It operates at 27,000 watts with a maximum flow rate of 1.5 gallons per minute, which is suitable for smaller households or point-of-use setups but might be limiting if you need simultaneous hot water at multiple fixtures. Its advanced flow control and self-modulation technology help save energy by adjusting power use based on demand, making it a strong choice if you're looking to reduce utility bills.
The digital LED display allows for precise temperature control, which adds convenience and helps maintain consistent water temperature. Installation is straightforward with a floor mounting method, and the unit is relatively compact at about 17 by 14.5 inches, so it won’t take up much space. However, it requires a 208-volt power supply, which might need electrical upgrades in some homes. The product is well-reviewed for reliability and efficiency.
If you want an energy-efficient electric tankless heater for a smaller capacity setting and don’t mind the electrical requirements, the Tempra 36 Plus represents a solid, dependable option.
The Stiebel Eltron Tempra 29 Plus is a powerful, high-efficiency tankless electric water heater designed to provide continuous hot water on demand. It delivers up to 3 gallons per minute, which is suitable for a household with moderate hot water needs, like running one or two showers plus a sink at the same time. Its compact size (about 17 by 15 inches) helps save space and the sleek design means no venting is required, making installation flexible for many homes.
The unit has a strong 28.8 kW power output, meaning it can heat water quickly with a notable temperature rise, which is great if you live in colder climates and need a consistent hot water supply. An LED display and two temperature memory presets make it easy to set and save your preferred water temperatures. On the energy side, it’s very efficient, so it won’t waste electricity heating water when you don’t need it. However, this heater requires a substantial electrical setup: a dedicated 240-volt or 208-volt hard-wired connection, 3 separate 40-amp breakers, and at least a 200-amp main service panel. This means you might need professional electrical upgrades, which can add to installation cost and complexity.
The unit is relatively lightweight at 24 pounds and mounts on the wall, freeing up floor space. If you have a large household or very high hot water demands, you might find the 3 GPM flow limiting, but for many, it balances power, efficiency, and convenience effectively.
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