8 Gallon Water Heater

The Best 8 Gallon Water Heater

Here are some of the best 8 Gallon Water Heaters on The Trade Table:

Rinnai RE Series with Smart-Circ™ 7.9 GPM Indoor NCTWH with Recirculation and Pump, LP

The Rinnai RE Series 7.9 GPM Indoor Tankless Water Heater with Smart-Circ™ offers high-efficiency hot water delivery powered by 199,000 BTUs of liquid propane. Its built-in recirculation pump and Smart-Circ™ technology reduce energy use and hot water wait times by learning your household’s hot water habits. With a compact, wall-mounted design and a max flow rate of 7.9 GPM, this unit supports multiple fixtures at once—ideal for homes or small businesses needing constant hot water.

Rinnai RE Series with Smart-Circ™ 7.9 GPM Outdoor NCTWH with Recirculation and Pump, LP

The Rinnai RE Series 7.9 GPM Outdoor Tankless Water Heater with Smart-Circ™ is built for powerful performance and energy efficiency in outdoor settings. With a weather-resistant design and a built-in recirculation pump, it delivers hot water instantly while learning usage patterns to reduce waste. Fueled by propane and rated at 199,000 BTUs, this system supplies up to 7.9 GPM, making it ideal for larger homes or commercial spaces that require reliable hot water at multiple points at once.

Frequently Asked Questions About The 8 Gallon Water Heater

Here are some Frequently Asked Questions about the 8 Gallon Water Heater:

What Is An 8 Gallon Water Heater Used For?

An 8 Gallon Water Heater is typically used to provide hot water to a single fixture or small area. It's great for places like under a kitchen sink, in a garage, or in an RV. These units are often used when you don’t need a large tank but still want quick, reliable hot water. It’s a practical choice for point-of-use heating.

How Long Does It Take An 8 Gallon Water Heater To Heat Water?

Most 8 Gallon Water Heaters take about 30 to 45 minutes to heat a full tank, depending on the power rating. Electric models heat slower than gas, but they’re quieter and easier to install. The recovery rate can vary, but they’re generally quick for light use. For one or two small tasks, the wait time is very manageable.

Can An 8 Gallon Water Heater Supply A Shower?

An 8 Gallon Water Heater may supply a quick shower, but it depends on your water flow and usage habits. For low-flow fixtures or short showers, it might do the job. However, for longer or hotter showers, the hot water may run out fast. It's best for handwashing or as a backup to a larger system.

Is The 8 Gallon Water Heater Energy Efficient?

Yes, 8 Gallon Water Heaters are generally energy efficient due to their small size and lower energy demand. They heat a limited amount of water, which means less standby heat loss. Many models also come with insulation and thermostats to regulate energy use. It’s a good option for saving on utility bills in low-demand situations.

Where Should I Install An 8 Gallon Water Heater?

Most people install 8 Gallon Water Heaters under sinks, in cabinets, or other tight spots where they need hot water fast. It’s best used close to the water outlet to reduce wait time and wasted water. Make sure there’s enough space for airflow and access for maintenance. Always follow local codes and the manufacturer’s recommendations.

Does The 8 Gallon Water Heater Need A Dedicated Electrical Circuit?

Yes, many 8 Gallon Water Heaters require a dedicated 120V or 240V electrical circuit. This ensures the unit has enough power and operates safely. Check the wattage on your specific model to know the exact requirement. It’s a good idea to consult an electrician for installation if you’re unsure.

Can I Mount An 8 Gallon Water Heater On The Wall?

Some 8 Gallon Water Heaters are designed to be wall-mounted, especially point-of-use models. Wall mounting can save space and make plumbing easier in tight areas. Be sure the wall and hardware can support the weight of the unit when it's full of water. Always follow the mounting instructions provided by the manufacturer.

Is An 8 Gallon Water Heater Enough For A Kitchen Sink?

Yes, an 8 Gallon Water Heater is usually more than enough for a kitchen sink. It can handle washing dishes, rinsing produce, and general cleaning with ease. If you often use hot water in quick bursts, this size is ideal. Just make sure the unit is installed close to the sink to avoid heat loss.

What Are The Dimensions Of A Typical 8 Gallon Water Heater?

Most 8 Gallon Water Heaters are compact, measuring around 15–20 inches in height and 12–16 inches in diameter. Some may be rectangular and a bit wider or taller, depending on the brand. They’re built to fit into tight places like cabinets or under counters. Always check the spec sheet for exact measurements before buying.

How Much Power Does An 8 Gallon Water Heater Consume?

Power usage depends on the model, but most electric 8 Gallon Water Heaters use between 1,500 to 3,000 watts. They don't run all the time—just when heating water or maintaining temperature. The energy cost is relatively low for light daily use. For the most accurate estimate, check the energy guide label on your unit.

Can I Use An 8 Gallon Water Heater In An RV?

Yes, an 8 Gallon Water Heater is a good fit for RVs, especially if you have moderate hot water needs. It can handle dishwashing, handwashing, and short showers. Make sure your RV's electrical system can support the unit's power draw. Also, choose a model that’s safe for mobile or compact installations.

How Do I Maintain An 8 Gallon Water Heater?

Regular maintenance includes checking the pressure relief valve and flushing the tank to remove sediment. If it has an anode rod, inspect it annually to prevent corrosion. Keep the exterior clean and ensure the area around it is dry. Following these steps will help your unit last longer and run more efficiently.

What Size Breaker Is Required For An 8 Gallon Water Heater?

Most 8 Gallon Water Heaters require a 15-amp or 20-amp breaker, depending on the model and voltage. Check the user manual or label for the exact requirements. Using the correct breaker is important for both safety and performance. If unsure, ask an electrician to confirm before installation.

Can An 8 Gallon Water Heater Be Installed Under A Sink?

Yes, 8 Gallon Water Heaters are often installed under sinks to provide quick hot water. This reduces the time you wait for water to heat up from a distant main tank. Make sure there's enough space and ventilation under the sink. Also, ensure easy access for servicing when needed.

Is There A Gas Version Of The 8 Gallon Water Heater?

Most 8 Gallon Water Heaters are electric, but a few manufacturers offer small gas-powered models. They’re less common due to ventilation needs and installation complexity. If you need a gas unit, ensure proper venting and check local codes. Electric versions are more popular for compact or point-of-use setups.

How Long Does An 8 Gallon Water Heater Last?

With good care, an 8 Gallon Water Heater can last 8 to 12 years. Regular maintenance and keeping it free of sediment buildup help extend its life. Quality of water and how often it's used also play a big role. Keep an eye out for signs of wear like rust or slow heating.

Can I Install An 8 Gallon Water Heater Myself?

Yes, if you're comfortable with plumbing and basic electrical work, you might be able to install it yourself. However, it's important to follow all safety codes and the manufacturer’s instructions. If you’re not sure about the wiring or water connections, it’s better to hire a professional. Improper installation can void warranties or cause damage.

What Kind Of Water Connections Does An 8 Gallon Water Heater Use?

Most 8 Gallon Water Heaters use standard 1/2" or 3/4" NPT pipe fittings for hot and cold water lines. The connections are usually on the top or side of the unit. Be sure to use the correct type of piping and thread sealant. Always check your model’s specs before hooking it up.

Is The 8 Gallon Water Heater Compatible With Solar Panels?

Yes, some electric 8 Gallon Water Heaters can work with solar systems, especially if paired with an inverter. However, you’ll need to make sure the system provides consistent voltage and meets the heater’s power needs. This setup works well for off-grid or energy-conscious homes. A professional can help design a safe and reliable system.

Does An 8 Gallon Water Heater Include A Thermostat?

Yes, most models come with an adjustable thermostat so you can set your preferred water temperature. Some units have external knobs, while others may require you to remove a panel to access the dial. Setting the temperature too high can waste energy or risk scalding. A comfortable range is usually between 120°F and 140°F.

How Much Hot Water Can I Expect From An 8 Gallon Water Heater Per Hour?

An 8 Gallon Water Heater typically recovers about 10 to 20 gallons per hour, depending on the wattage. This means it can reheat quickly after use for light-duty tasks. For continuous use, such as a long shower, it may struggle to keep up. It’s designed more for quick or occasional use.

Is An Expansion Tank Needed With An 8 Gallon Water Heater?

You might need an expansion tank if your plumbing system is closed or has a backflow preventer. The expansion tank helps absorb pressure from heated water expanding. It’s a safety measure that can protect your plumbing and the heater. Check local plumbing codes or ask a plumber to be sure.

Can I Use The 8 Gallon Water Heater In A Tiny Home?

Yes, it’s a great option for tiny homes where space and energy use are limited. It fits in tight spots and provides just enough hot water for sinks and quick showers. Its compact size makes it easy to tuck away in cabinets or under counters. Be sure to size it properly based on your daily water use.

What’s The Recovery Rate Of An 8 Gallon Water Heater?

The recovery rate depends on the wattage and voltage, but many recover around 10 to 15 gallons per hour. This means it can handle small tasks back-to-back with minimal wait. If you run out, it doesn’t take long to heat up again. It’s perfect for light daily use, not heavy continuous demand.

Can I Replace A 6-Gallon Heater With An 8 Gallon Water Heater?

Yes, in most cases you can replace a 6-gallon unit with an 8 Gallon Water Heater. Just check the dimensions and ensure you have enough space. Also, verify the electrical specs match your existing wiring. It’s a simple way to gain a little more hot water without major changes.

Does The 8 Gallon Water Heater Need Regular Flushing?

Yes, flushing your 8 Gallon Water Heater every 6 to 12 months helps remove sediment. This keeps the unit running efficiently and extends its life. It’s especially important if you have hard water. Just follow the manufacturer’s instructions for safe draining and flushing.

How Do I Drain An 8 Gallon Water Heater?

To drain it, first turn off the power and let the water cool. Connect a hose to the drain valve and open it to let the water flow out. You might need to open the pressure relief valve to help it drain fully. Once empty, you can flush it or perform maintenance.

What Voltage Does An 8 Gallon Water Heater Typically Require?

Most electric 8 Gallon Water Heaters run on 120V or 240V, depending on the model. Smaller units often use 120V and plug into standard outlets. Higher-powered models might need 240V and a hardwired connection. Always double-check the label before installing.

Can An 8 Gallon Water Heater Be Used As A Booster For A Tankless System?

Yes, some people use an 8 Gallon Water Heater to supplement a tankless system for faster hot water delivery. It helps reduce lag time when waiting for hot water to reach a faucet. This setup can be handy in larger homes or cold climates. Make sure the systems are compatible before connecting them.

How Much Does An 8 Gallon Water Heater Weigh?

Most 8 Gallon Water Heaters weigh between 25 and 45 pounds when empty. Once filled with water, the weight increases by about 65 to 70 pounds. Always factor in the full weight when planning wall or shelf installations. Check the manual for exact specs.

Where To Buy A 8 Gallon Water Heater?

You can buy a 8 Gallon Water Heater at The Trade Table.