5 Best Tankless Water Heaters of 2018

Updated on February 17, 2018
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Since completing university, Paul has worked as a bookseller; librarian; and freelance writer. Born in the UK, he now lives in Florida.

The Eccotemp L5 Portable Tankless Water Heater and Outdoor Shower is an outstanding unit that offers excellent value for money.  Great for outdoor use, this portable heater can be helpful when going on camping trips, boats, cabins, and beach holidays
The Eccotemp L5 Portable Tankless Water Heater and Outdoor Shower is an outstanding unit that offers excellent value for money. Great for outdoor use, this portable heater can be helpful when going on camping trips, boats, cabins, and beach holidays

When searching for the best tankless water heater, there are, of course, numerous considerations that you will want to take into account. I would certainly advise that you have a reasonable idea what your electrical and water requirements are, so that you can select the brand and model that best suits your specific needs.

The main questions to ask yourself are:

  • Is the heater for indoor or outdoor use?
  • Does it deliver an appropriate amount of power for your home?
  • Is the flow rate and water pressure appropriate for your needs?
  • Does it use electricity or gas for power?
  • Is it energy-efficient?

There are a number of different types of tankless water heaters, including electric, natural gas and portable. I present the top five below.

A reliable product that is easy to plumb in and use, the Stiebel Eltron Tempra 24 Plus offers convenient digital temperature control without any venting concerns.  The sleek design of the unit makes it attractive as well as functional.
A reliable product that is easy to plumb in and use, the Stiebel Eltron Tempra 24 Plus offers convenient digital temperature control without any venting concerns. The sleek design of the unit makes it attractive as well as functional.

The Stiebel Eltron Tempra 24 Plus: Reliable, Technologically Advanced, and Reasonably Priced!

One of the most reliable and technologically advanced heaters that you will find available is the Stiebel Eltron Tempra 24 Plus.

This sleek and sophisticated water heater can give you a constant temperature output regardless of the size of the hot water demand. It features a simple single flow sensor design, automatically adjusting the flow of water to prevent inconvenient temperature fluctuations.

It is easy to plumb in and operate, mainly because a Tempra requires no venting to the outside, saving you money and time.

As with all new water heaters, however, make sure that your electrics can support the new water heater, especially if you live in an old house.

The Eccotemp L5 is exceptionally portable so you can take it camping or to the lake or beach, if you require.  Powered by liquid propane, the heater requires a water supply and there is an adapter that allows you to connect up a garden hose supply.
The Eccotemp L5 is exceptionally portable so you can take it camping or to the lake or beach, if you require. Powered by liquid propane, the heater requires a water supply and there is an adapter that allows you to connect up a garden hose supply.

The Eccotemp L5: Great for Outdoor Use!

One of the great things about the Eccotemp L5 is that it is portable. You can take it pretty much anywhere, making it ideal for outdoor use - camping, boats, cabins, etc.

It comes with a shower head so that you can use it to take a hot shower after a day on the beach, or wherever you are.

Powered by liquid propane, a strong flame heats the water as it passes through - you will need to find a source of water to feed through it, but there is an adapter that allows you to attach it to any common garden hose type of nozzle.

Easy to Install and Versatile!

The Rheem RTE 9 is another great water heater. Designed to be very efficient and compact, this on demand water heater manages to be both easy to install and versatile, whether you need the hot water for a home, RV or Boat.

The water connection is a standard half inch and it has an on-unit temperature control. The brass/copper heat exchanger is durable and hard wearing.

Ecosmart ECO 27 Electric.  Efficient and economic this top-rated water heater has the potential to save you big money on your fuel bills.  It is particularly suitable for use in homes in the northern USA and Canada.
Ecosmart ECO 27 Electric. Efficient and economic this top-rated water heater has the potential to save you big money on your fuel bills. It is particularly suitable for use in homes in the northern USA and Canada.

Efficient and Economic!

The Ecosmart ECO 27 is an exceptionally efficient and economic electric heater. Designed to be capable of heating incoming water with temperatures as low as 37 degrees, this model is especially well suited for homes located in the Northern USA and Canada.

With an energy efficiency rating of 99.8% and its patented self modulating technology, this electric water heater is capable of saving the consumer big money on heating bills - up to 60% in some circumstances.

The Rinnai RL75iN delivers up to 7.5 gallons of hot water per minute (GPM), and its efficiency will save you energy and money.  The unit can be mounted in virtually any room with venting to the outside.
The Rinnai RL75iN delivers up to 7.5 gallons of hot water per minute (GPM), and its efficiency will save you energy and money. The unit can be mounted in virtually any room with venting to the outside.

Ideal for Two or Three Bedroom Homes: The Rinnai RL75iN!

The Rinnai RL75iN is ideal for providing water for 2 or 3 bedroom homes. A natural gas powered device capable of delivering 7.5 gallons of hot water per minute, the RL75iN is energy efficient and very economical.

The Rinnai can be mounted in pretty much any room and vented with a single wall or roof penetration to the outside. It is possible that you will need to buy special pipes, however, contact your local Rinnai distributor for detailed advice.

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    © 2013 Paul Goodman

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