The ‘On Demand Hot Water Heater’ is an exceptional appliance designed to provide instantaneous hot water whenever you need it. Unlike traditional hot water tanks, which continuously heat and reheat water, this state-of-the-art system heats water on demand, saving both energy and money. It features a compact design that takes up minimal space, making it perfect for homes of all sizes.
This water heater has an incredibly efficient heating element and advanced flow technology, which ensures you’ll never be left out in the cold. It has a high-capacity output, yet remains environmentally friendly, significantly reducing energy consumption compared to conventional tank heaters.
One of the highlights of the On Demand Hot Water Heater is its intuitive user interface that allows straightforward temperature adjustment for optimal comfort. Constructed with high-quality, durable materials, it is designed for lasting performance and reliability.
In essence, the On Demand Hot Water Heater combines innovation, efficiency, and convenience – an essential addition to any modern home. Whether you require hot water for a soothing bath, doing dishes, or laundry, this product ensures you have a steady supply of hot water in an instant, making your life a little bit easier every day.
Expert’s Top 10 Picks & Best On Demand Hot Water Heater, Expert’s Top Recommendations
1#. Tankless Water Heater Electric, thermomate 3.5kW 120V Hard Wired Point of Use On Demand Hot Water Heater Self Modulating ET035 (NO PLUG) (White)
Features
Instant Heating – 24 hours ready to continuously supply instantaneous hot/warm water at preset temperature throughout your home only when needed. NO standby energy consumption. NO wait for tank to fill up. MUST HARD WIRED, NO PLUG. Drawing only 110-120 Volts
Space Savings – 7.8W×6.3H×3.9D inch, compact small Point of Use water heater designed for Single Sink use, wall mounted fitting in small spaces throughout kitchen closet, bathroom sink, hair salons, bar counters and hotel receptions. Temperature ranges from 85°F- 131°F
Self Modulating – On demand water heater automatically adjust the power based on the change of inlet water flow and temperature, saving up to 50% energy consumption and preventing over-heating.
Safe & Healthy – ETL certified and equipped with Multiple Protection from leakage, dry fire, over-heating and over pressure. IP25 waterproof. Stainless steel heating element and no storage water, preventing sediment / scale build-up.
User Friendly – Touch control panel and digital temperature display, easy to set your desired temp. Lightweight and easy to install vertically facing up or down. Open tap to start the unit heating with activation flow rate of 0.4GPM.
Important Note – Please verify this unit is the right size for you: 3.5kW@120V, requiring 40A Circuit Breaker, 10AWG wire size and 1/2″NPT water connections
2#. Portable Water Heater Propane Tankless – 6L 1.58GPM RV on demand Hot Gas Outdoor Digital Display Water Heater for Camping,Boat,Cabins
Features
【On Demand Hot Water】Maximum power output 42,000btu/hour, get instant endless hot water easily wherever you are. No need to preheat before using tankless water heater. As soon as you turn on the tap, the water flows with your desired temperature. Low water pressure start up, just need 2.5 PSI of water pressure. 1.58 gallons per minute of on-demand hot water. Fully adjustable heat and water flow.
【CSA Approved Safety 】RUINOPAR Tankless Water Heater with CSA Approved Regulator, safe as per Canadian and US Standard.Automatically decrease water pressure between 2.5-145PSI. The anti-freezing drain plug can discharge the residual water to avoid freezing in cold areas or in case of long time no use. High water temperature protection over 167°F. Shut off gas supply automatically under unexpectable flameout.
【Safety Protection】The safety of the propane water heater is also an important thing that everyone will value very much; Our products have more than 6 protection methods; The product has safety protection that measures such as overheating protection, antifreeze protection, flame-out protection, anti-dry protection, high water pressure protection and low water flow protection, which prevent the product from doing harm to users,providing a comfortable and safe bathing conditions, reliable product.
【Lightweight Portable Design】Compact size and lightweight design for easily carry. It can bring a amazing hot shower for you when you are camping , to the beach, etc. Also you can wash your pets with this tankless water heater in outdoor. Using the handle of the gas water heater or the mounting bracket on the back to hang it. It only takes you a few minutes to install it.
【Energy Saving】With automatic ignition and flameout modes, when you turn on the shower nozzle, the tankless water heater automatically ignites, and when you turn off the shower nozzle, the water heater automatically put out the flame; With this unique design, our heater can save 11.5% energy for you and ensure your safety at the same time.
★【Important Tips】To avoid gas leakage caused by improper sealing of the water heater, DO NOT TWINE TEFLON TAPE between gas regulator and gas inlet pipe. The tankless water heater will “caught on fire “with improper operation. Always check gas leakage before operation.
★【2-Year Quality Warranty】We provide the 24-month warranty for the gas water heater, replace a new set directly once it has any quality problems.If you encounter any product after-sales problems, you can always contact the RUINOPAR support team, we will give you a satisfactory solution within 24 hours,Professional team is always online.
3#. Camplux Tankless Water Heater, 2.64 GPM On Demand Instant Hot Water Heater, Propane Tankless Water Heater Indoor, White
Features
2.64 GPM Instant Hot Water -Camplux high capacity 2.64 GPM propane tankless water heater delivers 2.64 GPM on demand endless hot water ensures instant hot water for any small homes, cabins or apartments. On demand water heater only heats the water when you need it and no waiting for preheat.
6-IN-1 Multiple Protection- Flame-out protection, anti-freezing protection （manual drainage needed）, over-heating protection, air flow pressure switch protection to ensure the safety. Safe electronic ignition system, plugs into standard 120V electrical outlet with UL-listed cord.
Easy Installation -The propane water heater uses standard 1/2″ NPT water fitting and gas inlet. Comes with 2″ horizontal vent pipe,ensures efficient power ventilation. Minimum activation rate: 0.65 GPM; Maximum input rating: 68,000 BTU; Water connection location/size: Bottom/0.5-inch NPT. You will need a gas regulator ( Camplux model KR-106A )＆1 pc 5/8″ NPT male to 1/2″ BSP female gas connector adapter if you want to hook this water heater up to a propane tank.
Compact Design,Energy saving -The compact size instant hot water heater saves more space than traditional tanks.Trendy and modern design with fahrenheit digital temperature display. Eco and Full gas switch for energy saving and get ideal hot water temperature.
Considerate Customer Service- Here at Camplux, customer service is everything ! We offer 24 shift hours customer service make the customer experience easy and fast through our live chat, phone support & our online helpdesk. Have a question? Give us a call at (844) 538-7475.
4#. Airthereal Electric Tankless Water Heater 18kW, 240Volts – Endless On-Demand Hot Water – Self Modulates to Save Energy Use – Small Enough to Install Anywhere – for 2 Showers, Evening Tide series
Features
☼ Endless Hot Water: Imagine you are the last one in your family to take a shower before heading out for the day. You turn on the faucet and the water is freezing cold. Too bad you don’t have an Airthereal Electric Tankless Water to provide endless hot water on demand with no preheating, temperature fluctuations, or running out of hot water in the tank.
☼ Save Space: That water heater in the basement or utility closet takes up a ton of space. This wall-mounted water heater uses 90% less space than a traditional hot water heater with a tank.
☼ Save Energy: Water is only heated when you need it, not stored in a hot water tank. The self-modulating temperature technology only uses energy to heat up water while you are using it to save up to 50% on water heating energy compared to a typical tank water heater.
☼ Important Note: In order to install 18kW Electric Tankless Water Heater it requires 240 Voltage, 2 x 40 AMP Circuit Breaker Size and a set of 2 x (8AWG/2) wires. Please check to confirm that your breaker panel meet these specifications.
☼ Safe To Use: With high temp protection, dry heating protection, and electrical leakage protection you can rest easily knowing you have safe, on-demand hot water to use on your schedule. The electric and fluid systems are completely separated to prevent electric leakage and water pipe corrosion.
5#. Camplux Electric Water Heater 6kW, Instant Hot Water Heater 240V, On Demand Water Heater with Digital Display, Hard Wired, Black
Features
Consistent Hot Water: The under sink water heater only heats the water when you need it and no waiting to preheat, saving up to 50% in energy consumption. The temperature rise of 1.0 GPM is 50°F. Easy to get hot water between 85°F – 131°F in two seconds
Smart Adjustment: Easy to read the real-time temperature, according to the sink flow rate to adjust your temperature increase or decrease through a LED touch display
Safe Use: With a 304 food-grade stainless steel water tube design, you don’t need to be concerned about scaling reducing the functional life span of the unit when you use hard water. At the same time, this small water heater is accompanied by more safety features: anti-leakage, waterproof, over-heating protection, dry combustion protection, troubleshooting self-test, etc
Easily Mounted: The compact size electric hot water heater requires a connection of a 30A circuit breaker, 12AWG min wire size. Hardwire to install close to an outlet for energy saving. It fits under your bathroom sink or kitchen sink to provide hot water right where you need it. Please make sure it is the right size for you: 6kW at 240V, product dimensions 10.95″ x 7.4″ x 2.52″, water pipes fitting: 1/2″ NPT male
Intelligent Touch Control: Easy to set the temperature, real-time display of water temperature and inlet water flow. Enjoy instant and endless hot water
IMPORTANT TIP- This 240 volt point of use water heater MUST BE HARD WIRED, NO PLUG. MUST be permanently connected to the fixed circuit breaker and it must be installed vertically. Please note this mini hot water heater is only suitable for sink use, not for bathing
6#. Camplux 2.64 GPM Propane Portable Gas Water Heater, Outdoor Tankless Camping Water Heater with Digital Display, White
Features
CSA Safety Standard -CSA safety standard approved tankless propane water heater,flame failure device, anti-freezing protection, over heating protection to ensure the family safety. Automatically decrease water pressure between 3.6-110 PSI. The anti-freezing drain plug can discharge the residual water to avoid freezing in cold areas or in case of long time no use. The propane hot water heater will shut off automatically when high water temperature protection over 176 °F.
Lightweight Portable Design-Compact size and weights 23 lbs for easily carry. Hang it using the mounting bracket on the top/back of the gas water heater. It only takes you a 15 minutes to install the propane water heater.
Energy Saving-Compact and light weight structure with 11.5% energy saving technology.The propane gas water heater exchanger and main burner are designed with advanced combustion technology to decrease gas consumption and burning noise.
2.64 GPM Instant Hot Water- Maximum power output 68,000btu/hour, you can get 2.64 gallons instant endless hot water easily wherever you are. No need to preheat before operating the tankless gas water heater. As soon as you turn on the tap, the water flows with your desired temperature.
Important Tips -To avoid gas leakage caused by improper sealing of the water heater, DO NOT TWINE TEFLON TAPE between gas regulator and gas inlet pipe. The propane tankless water heater will “caught on fire “with improper operation. Always check gas leakage before operation.
7#. Rheem 11kW 240V Tankless Electric Water Heater
Features
ON/OFF Dial Control with adjustable digital temperature display
Self-modulating power control
11kW Model Flow Rate: up to 2.68 GPM
Side 1/2″ NPT water connections
On demand, consistent and continuous hot water
8#. Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Features
ON/OFF Dial Control with adjustable digital temperature display
Self-modulating power control
24kW Model Flow Rate: up to 5.9 GPM for RTEX-24
Bottom 3/4″ NPT water connections
On demand, consistent and continuous hot water
9#. Bosch Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5) – Eliminate Time for Hot Water – Shelf, Wall or Floor Mounted
Features
CONVENIENT HOT WATER HEATER: 2.5 gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it. Thermal efficiency is 98%. Dimensions : 13.75 W x 13.75 H x 10.75 D Inches
LONG LASTING QUALITY: This electric water heater is easy to maintain and has premium glass-lined material for a long service life. (Amps 12A, Volts (VAC) 120)
INDEPENDENT INSTALLATION: 36-37″ cord plugs into a 120 volt outlet for independent installation or in-line with a large hot water source
FAST RECOVERY RATE: Eliminates long waits for hot water at your sink, get on demand hot water at your every need (supplies up to 2 sinks at a time)
EASILY MOUNTED: Can be shelf, wall or floor mounted (bracket included); simply tap into the cold water line and install the water heater directly at the sink to provide hot water. Mini-tank water heaters are the perfect solution for a variety of applications such as small homes, garages, offices, in-law suites and anywhere you need hot water produced at the point-of-use.
10#. HAIYEATBNB Tankless Water Heater Electric 110v，5.5kw On Demand Water Heater Under Sink With Remote Control
Features
Instant Hot Water: Experience the convenience of instant hot water with our Tankless Water Heater Electric 110v. Say goodbye to waiting for the water to warm up! This compact and powerful unit delivers hot water on demand, providing a quick and efficient solution for your daily needs.
Space-Saving Design: Designed with American living habits in mind, this tankless water heater is perfect for maximizing space in your home. With its compact size, it can be easily installed under the sink, freeing up valuable floor space in your bathroom. Enjoy hot water whenever you need it, without sacrificing precious square footage.
Energy Efficient: As energy conservation is a priority for many American users, our tankless water heater electric is designed with energy efficiency in mind. The 5.5kw power rating ensures optimal performance while consuming minimal electricity, helping you reduce your energy bills and environmental footprint.
Convenience: With the included remote control, operating and adjusting the water heater has never been easier. From the comfort of your couch or bed, you can effortlessly turn the unit on/off, adjust the temperature, and customize the settings to suit your preferences. Enjoy the luxury of controlling your hot water without leaving your seat.
Installation Instructions: The wire requires 6mm ² (9AWG), circuit breaker ≥ 60AMP, thread size: 1/2 “NPT,please contact a license electric person to help you complete this project.
