2021 Under Sink Water Heaters Reviews – Best Picks

The joy of having some hot water flow through the sink faucets in your home is unrivaled, especially when it’s winter-cold and you need heated water to wash the dishes, take a bath, or just warm up your hands. If you need constant hot water from your faucets, consider under-the-sink water heaters. There are a lot of instantaneous water heater reviews available out there, but we have taken the time to compile an honest look tailored to your needs.

under sink water heater

Be sure to read through to the end of this review and choose the under-the-sink water heater you feel will best serve your needs in the kitchen, garage, outdoor, or bathroom sink.

What is an Under the Sink Water Heater and How Does it Work?

As the name suggests, an under-the-sink water heater is a small, compact water heater that fits under the sink to provide hot water directly to a faucet.

Under the sink water heaters are also a type of point-of-use water heaters.

A tankless under-the-sink water heater heats water as it flows through the hot water faucet. On the other hand, a tank storage water heater preheats water and stores it hot in a tank or receptacle ready for use when you open a hot water faucet.

What to Consider When Buying an Under the Sink Water Heater

As with any other product, you must consider several factors before deciding on the best under-the-sink water instant hot water heater for your needs.

Tankless vs Tank Storage Water Heater

You can choose between two types of water heaters based on the water flow or storage system.

A tankless under-the-sink water heater heats water as it flows through the hot water faucet whereas a tank storage water heater preheats water and stores it hot in a tank or receptacle so you have heated water ready for use when you open a hot water faucet.

However, they are more expensive and will milk your wallet drier compared to their tank storage counterparts.

Tank storage under the sink water heaters preheat water and store it hot in the tank ready for dispensing when needed. Although they take up more space, they are better if you live in an area where power outages are common since you can always preheat your water.

Water Heater Capacity

A tankless water heater’s capacity is determined by the number of water gallons it heats in a minute. The number here may range from lows of 2.5 gallons to 6 or more gallons per minute.

For a tank storage water heater, its capacity refers to how many gallons of water it can hold physically when full. The number of gallons here also differs depending on the model and can range between 2.5 and six gallons or more.

Energy Rating

The higher the energy rating of the under sink water heater you choose, the more efficient it is. Higher efficiency translates into better energy usage and reduced power bills for electric heaters.

Dimensions and Space Consumption

Although under the sink water heaters are small and compact for fitment in small spaces under the sink, you should measure out your sink space first to ensure you find a heater that will fit well in it.

Safety Measures

Safety features for under-the-sink water heaters range from modulation, thermostats, and pressure relief valves.

The thermostat is for regulating temperature while the pressure relief valve controls pressure build-up in the system, which is particularly crucial with gas-powered water heaters to eliminate the chances of explosions.

Review of the Best Under Sink Water Heaters

If you are planning to buy a suitable under sink water heater for your home, we’ve got your back with the review below of some of the best models on the market in 2021.

1. Bosch Electric 4-gallon Mini-tank Tronic 3000 T Water Heater

Bosch Electric 4-gallon Mini-tank Tronic 3000 T Water Heater

Bosch is known for its wide variety of power products, and this mini-tank electric heater is among the best on the market.

The heater has a 4-gallon water capacity for the tank, which is slightly higher than the usual 2.5-gallon capacity in most tank storage water heaters.

As a compact under-the-sink water heater, this one measures slightly above ten inches on the length, width, or height sides. It is also versatile as it allows for different installation methods by mounting on the floor, a wall, or a shelf.

2. Camplux ME25 2.5-gallon Mini Tank Electric Water Heater

Camplux ME25 2.5-gallon Mini Tank Electric Water Heater

If you are on the market for a handy under-sink water heater for outdoor use in the patio or backyard kitchen, this is your go-to solution. The built-in insulation foam makes it suitable for the outdoors as it reduces heat loss due to greater exposure to the atmosphere.

The heater also has a thermostat for temperature control and a high limiting device to protect it from overheating.

The ME25 water heater has versatile installation methods as you can mount it on the floor, against a wall, or on a shelf.

You have the liberty to choose between 1.3, 4, and 6-gallon models of the water heater.

3. Stiebel Eltron 074050 Single Sink Point-of-use Tankless Electric Water Heater

Stiebel Eltron 074050 Single Sink Point-of-use Tankless Electric Water Heater

Despite the bigger size of this Stiebel Eltron tankless water heater, you can still fit it in a sizable sink to supply hot water on demand. The heater comes with a generous 3-year warranty that becomes valid only if the unit is installed by licensed personnel.

The downside to the Stiebel Eltron heater is that it doesn’t have modulating technology or temperature adjustment options for the user.

4. Bosch US12 Tronic 3000 Electric Tankless Water Heater

Bosch US12 Tronic 3000 Electric Tankless Water Heater

Bosch rocks the domestic water heating market with yet another heater with a generous warranty of five years for the heating element and a one-year limited warranty on other heater components.

The heater allows for thermostatic control for temperature adjustment as per your preference. The unit is small and compact, measuring only 12.75 x 6.5 x 3 inches for easy fitment in the kitchen, bathroom, or garage sinks.

Bosch US12 electric tankless water heater boasts a high-efficiency rate of up to 98% as it significantly reduces standby heat loss.

Bottom Line

An under sink water heater is always an excellent addition to your home for domestic water heating needs at specific points of use in sinks with hot water faucets.

You can not go wrong with any of the four models we have explored, but you have to first decide between a tankless or tanked water heater, the capacity of the hot water supply you want, and the amount of space you have under your sink.

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