Design & Plan, DIY, Off-Grid


One of the commonly asked questions by members of the tiny house community is about which tankless water heater is best for a tiny house. Tankless water heaters as a regularly used daily residential equipment, can be relied upon in a large or tiny home with different flow rates. However, tiny houses do not have ample space for a large heater and therefore purchasing a tankless water heater will definitely do the trick. In this article, we are going to examine some of the best tankless water heaters for your tiny house that you can lay hands on.


Types of Tankless Water Heaters for your Tiny House

There are basically three types of tankless water heaters that you can use in your tiny house. They include Propane type, electric type and natural gas types.

1. Electric Tankless Water Heater

Most tiny house owners prefer using an electric water heater since it is the most common.  It has a light weight and its compact shape makes it a good choice for any tiny house. The flow and power rate of an electric tankless water heater is normally low hence meeting the needs of tiny houses with single bathroom use.


2. Propane Tankless Water Heaters

Propane water heaters require propane tanks which are usually stored on the exterior of your small house. They have large power and flow rate thus making them suitable for use in multiple bathrooms.

3. Natural Gas Tankless Water Heaters

Natural gas tankless water heaters are quite similar to propane heaters as they all have large power and flow rates. It is therefore suitable for tiny home owners with a huge family as they provide hot water for multiple bathrooms use.


Features of the Best Tankless Water Heater for Your Tiny House

Before choosing a tankless water heater for your tiny house, you need to closely examine all the important features. These features include:

Small Shape

The most important feature of a tankless water heater for tiny houses is the small shape. This is because tiny houses tend to have less space thus you cannot install a large water heater on the wall.  With the small and compact shape, it becomes easier for you to save large amount of space for your home.

Short Waiting Time

Tankless water heaters for tiny houses should have a shorter waiting time unlike the large home types. This is mainly because they have a short pipe and thus it will only take a few seconds for hot water to flow.

Small Flow Rate

A good tankless water heater should not have a large flow rate since it only serves one or two bathrooms. This is an important feature as it helps in saving energy and heating costs.

Best Tankless Water Heaters for Tiny House

Here are some of the best tankless water heaters that you can install in your tiny house:

1. EcoSmart Eco 11 Electric Tankless Water Heater

EcoSmart electric tankless water heaters are currently leading the industry thanks to the new self-modulating technology. The Eco 11 is ideal for tiny houses and can be used for single or multiple applications depending on the climate of your area. When using the unit in warm areas, it can handle one shower and two sinks running simultaneously.


  • Eco 11 has the most advanced self-modulating technology which allows it to use the energy that is needed.
  • Sleek, wall-mounted designs saves floor space for more storage.
  • When sized correctly, it will offer endless on demand hot water.
  • Eco 11 saves heating costs as it only turns on when you need hot water.

2. EcoSmart Eco 27 Electric Tankless Water Heater

This is one of the widely used tankless water heaters in tiny homes. Any tiny house owner who has had a chance to use this type of water heater will tell you that it offers a good return on your investment.


  • Replacing the heating elements is quite easy and will not require you to dig deeper into your pockets.
  • Runs two showers at the same time.
  • Made of stainless steel and copper components making it durable.
  • Unlimited hot water supply.
  • There is large flow rate thus guaranteeing constant hot water supply.


Below are some of the features that make EcoSmart Eco Electric Tankless Water Heater a good choice for your tiny house:
  • Saves Space

This water heater is among the lightest and smallest when compared to other EcoSmart tankless water heaters. The small size makes it suitable for use in tiny houses be it a THOW or on a foundation since it does not occupy much space. After installation, the water heater will save close to 12 cubic feet thus giving you more room for other household equipment.

  • Digital Control System

Operating the water heater is quite easy since you only have to rely on the digital control system. With this system, you can adjust water temperature up and down until you are able to find the exact temperature you need.

  • Cost Saving

Saving water heating cost will never be this easy again as the heater relies on self-modulating technology to draw energy only when in use. Moreover, it also has an internal design that plays a key role in cutting down water heating cost in your tiny house.

3. Eccotemp FVI-12 Liquid Propane Tankless Water Heater

Eccotemp FVI-12 Liquid Propane Tankless Water Heater is a common option for owners of solar tiny houses. This is mainly because it consumes less energy while still serving the intended purpose. However, you will first have to invest in propane blankets if you are to keep the system safe.



  • Compact Design

The water heater has a stylish compact shape which saves much wall space for your tiny house. Furthermore, it also contains an extremely light unit hence you can hook it up anywhere you want.

  • Self-Modulation System

It has a self-modulating system which activates only when in use thus saving energy. You will therefore never have to worry about incurring huge energy bills. However, you will have to rely on the best ventilation facilities for your tiny house if you are to use this water heater safely.

  • Safe Electronic Ignition System

The unit adopts an electric ignition system just as most Eccotemp tankless water heaters. You must plug the ignition system into a standard 120v electrical outlet with UL-listed-cord if you are to use it effectively.


  • Saves more energy when compared to most tankless water heaters in the market.
  • Has a small shape and light weight making it suitable for your tiny home.
  • Endless hot water supply.
  • Good for a tiny house owner who uses a single bathroom.
  • Low working noise.

4. Noritz NRC661-DV-NG Indoor Condensing Tankless Hot Water Heater

Noritz tankless water heaters have become popular among members of the tiny house community. The Noritz NRC661-DV-NG is specifically an indoor hot water tankless heater. You will therefore have to purchase more venting kits if you are going with this option.


  • Saves money since you do not have to incur huge bills.
  • Copper and Stainless steel components guarantee durability.
  • Has a compact shape which saves space in your tiny house.
  • This unit can be used in areas with a cold climate.
  • Large flow rate and supports two bathrooms.


  • Endless Hot Water Supply

This unit will definitely meet your demand of enjoying hot water when bathing and washing. Actually, it supports hot water for two bathrooms making it a perfect gas tankless water heater for your tiny house.

  • Two Heat Exchangers

The unit comes fully fit with a copper and stainless steel heat exchanger, offering more options in terms of connection. Both heat exchangers are resistance to corrosion thus giving the unit a prolonged life.

  • High Efficiency

The unit uses most of the natural gas with minimal wastage thanks to its condensing capabilities. In addition to this, it is also environmental friendly as the Nox design greatly minimizes emission of Nitrogen Oxide.

5. Bosch Tronic 2.5 Gallon Electric Mini-Tank Water Heater

This unit is a point of use tankless water heater which can be relied upon for use in bathroom sinks or kitchen faucet.  You can mount Bosch Tronic on the floor or simply hung it on the walls.



  • Small and compact shape

The unit is super small and can be easily hidden under the sink. It is highly advisable that you install it near the location you intend to use hot water.

  • 2.5 gallons water flow

Just as the name suggests, this unit allows water flow of 2.5 gallons per minute. You will therefore get a constant supply of hot water in your kitchen or bathroom.


  • Fast recovery on hot water.
  • Easy to install in your tiny house.
  • Simple to operate.
  • Perfect option for sinks.



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Without ventilationm, it will prove difficult to live in your tiny house. Avoid putting yourself in this situation by relying on the following tips for ventilation in a tiny house.


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