The Chronomite SR-20L/240 HTR is a low-flow electric tankless water heater. It is 9.6 inches long and weighs 4.4 pounds.
This Chronomite water heater is not only lightweight but also meant for horizontal installation. It can only power low-flow shower faucets and is most suited as an under-sink water heater. The heater can also supply hot water to showers and bathrooms located far from bigger water heaters. The Chronomite is small and simple to install. This low-cost installation requires simply mounting it on a wall and connecting it to water and electricity supplies.
Chronomite provides optional stainless steel housing for the tankless water heater. This keeps it protected when you install it in damp locations such as underneath a sink. At the bottom of the unit are two mounted compression fittings made of chrome. These are 3/8-inch cold water inlet and hot water outlet connections. There is also a knockout rear electric connector.
Though small and portable, the heater requires 240 volts of electricity. You need to run a dedicated 240-volt outlet that can also deliver 20 amps of electricity to the water heater. These figures mean that the unit has an electric power requirement of 4,800 watts, which is even more than some full-sized electric tankless water heaters consume, such as the EcoSmart ECO 27. On the other hand, this Chronomite heater handles small volumes of water and does not run as long. Its overall electricity consumption is still small enough to make it energy-efficient.
The Chronomite turns out warm water within two seconds of you turning it on. This is three times less than the time required for the average tankless water heater to produce hot water. This water heater also uses a microprocessor to regulate its electricity consumption and water output temperature. In this way, it provides a steady supply of on-demand hot water at the temperature you preset.
This water heater also has a low activation flow rate of 0.35 gpm. However, it can only raise water temperature by 33 degrees Fahrenheit at its peak flow rate of 1 gpm. With an 82-degree temperature raise, the flow rate dwindles to 0.4 gpm. The Chronomite mostly produces warm water and has a low flow rate. Cranking it up to produce hot water may lead to interrupted water flow.
The Chronomite SR-20L/240 HTR is an under-sink, low-flow electric tankless water heater. While installing it is simple, you need to make significant provisions for its 240-volt requirement. It has a very low flow rate when you want really hot water from it.
We’ve evaluated tankless water heaters since 2015, spending over 50 hours researching the best manufacturers in the industry. As we created this guide, we looked at representative models from each of the 10 best brands we found. Of these models, we chose to highlight ones that are best for various uses such as whole-home, single-sink and single-bathroom water heating.
Best for Most Homes
The EcoSmart ECO 27 is an energy-efficient tankless water heater that’s a good option for average homes without huge demands for hot water. It can heat up to 6.5 gpm, which is enough water for up to four showers at the same time. While it doesn’t produce nearly as much hot water in cooler climates, it’s still powerful enough to produce up to 3 gpm, which is enough water for two simultaneous showers and much better than smaller tankless water heaters. The EcoSmart ECO 27 has a digital display that lets you set the exact water temperature between 80 and 140 degrees Fahrenheit. This model has a lifetime warranty, which is exceptional among tankless water heaters. However, you must have a professional install it to qualify for warranty coverage.
Best Budget Model for Under Sinks
The Chronomite SR-20L/240 HTR has a flow rate of 0.5 gpm, which makes it ideal for heating the water in a single sink. This is particularly helpful if you have a sink that’s far from your main water heater, as it can keep you from wasting water while you wait for it to heat up. This unit costs less than $200, which makes it an affordable way to increase your home’s hot water production without replacing your water heater. It does a good job raising water temperature at lower flow rates, but it can’t provide hot water for an entire bathroom or home, especially in colder climates.
Best for Most Bathrooms
The Rheem RTE 13 tankless water heater is powerful enough to heat 4 gpm in warmer climates, which is enough to supply multiple bathrooms – up to three faucets, showers or bathtubs. In colder climates, however, it can only produce 2.54 gpm, just enough for a single bathroom sink and shower running together. The compact design means you can install it under your sink or inside the bathroom vanity to keep it out of view. The RTE 13 has an Energy Star certification, which means it’s more efficient than standard tankless water heaters. Rheem provides a 10-year heat exchanger warranty on the RTE 13, though the unit must be installed by a licensed technician to qualify for it. All other parts carry a one-year warranty.