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Chronomite M-series Instant-Flow Micro Water Heater. Output Set Temp.

Original price $299.00 - Original price $299.00
Original price
$299.00 - $299.00
Current price $299.00


Buy this Chronomite Instant-Flow Micro Water Heater with adjustable output temperature limits.

The Instant Flow Micro uses digital microprocessor technology and features an adjustable output temperature limit. Note this limit is a maximum output temperatures, not minimum and not guaranteed. Your actual output temperature will depend on your incoming water temperature and output flow rate. The heater ships with a preset temperature according to your choice in the menu above.

This instant hot water heater responds to fluctuations in incoming water pressure, temperature and flow rate regulating water temperature more than a hundred times per second. This prevents scalding issues and mixing valves won't be necessary. It offers the same easy installation, unlimited hot water, compact design, and 50% more energy efficiency than other instant water heaters that have no microprocessors. The Instant-Flow Micro Inline Water Heater is great for sinks, bathrooms, and many other applications.


• Unlimited hot water in two (2) seconds
• 99% energy efficient and budget-saving
• Low-cost, hassle-free installation and maintenance
• A space saver. Compact size at point of use
• Factory preset temperature: promotes healthy hand washing without scalding risks
• Safe, clean, on-demand hot water eliminates the need for storage tanks, which may promote the bacteria growth and proliferation
• Certified Lead-Free. Water is safer for drinking.
• Self-cleaning feature prevents calcification buildup
• USA-made
• UL Listed
• ADA-compliant
• Meets applicable building codes including ADA, UL, IAPMO, UPC, CSA.
• Meets all CAL GREEN low flow requirements
• Meets LEED v4 low flow requirements (less than 0.4 GPM and 1.5 LPM)
• Full 1-Year Warranty
Made in America

Instant-Flow Micro Models

Low Flow 0.35 GPM Flow Rates
Standard Flow 1.0 GPM Flow Rates


Rise at
0.8 GPM





Rise at
1.0 GPM




M15L/277 35°F 277 4150 15 M30/208 43°F 208 6240 30
M20L/120 20°F 120 2400 20 M30/240 49°F 240 7200 30
M20L/208 36°F 208 4160 20 M30/277 57°F 277 8310 30
M20L/240 41°F 240 4800 20 M40/208 57°F 208 8320 40
M20L/277 47°F 277 5540 20 M40/240 66°F 240 9600 40
M30L/120 31°F 120 3600 30 M40/277 76°F 277 11080 40
M30L/208 53°F 240 6240 30          
M30L/240 61°F 240 7200 30          
M30L/277 71°F 277 8320 30          
M40L/208 71°F 208 8320 40          
M40L/240 82°F 240 9600 40          
M40L/277 95°F 277 11080 40          

• The microprocessor in the Instant-Flow Micro adjusts its power usage according to the flow rate, incoming water temperature and pressure to provide the factory preset water temperature.
• 240V is used for all shown calculations. Operation at 220V will result in a 15% wattage and heating decrease.

Technical Specifications

Dimensions: 6.25" x 9.675" x 2.75"
Weight: 4 lbs.
Materials: Rugged cast aluminum housing. Celcon plastic element assembly with nichrome coils
Housing Color: White
Minimum heated water flow rate for Standard Flow models: 0.65 GPM
Minimum heated water flow rate for Low Flow models: 0.35 GPM
Minimum heated water flow rate for M40/240, M40/277, M50/240 models: 1.0 GPM
Minimum Water Pressure: 25 PSI
Maximum Water Pressure 150 PSI
Maximum Output Water Temperature: 140°F
Certifications: UL, IAPMO, UPC, ADA

Digital Microprocessor Technology

• Immediate response to changes in incoming water pressures, temperatures and flow rate
• No more scalding concerns with factory preset temperatures
• Regulates water temp 120 times per second
• Up to 50% more energy efficient than non-microprocessor water heaters
• Eliminates mixing valves

Chronomite Instant-Flow Micro Water Heating

Optional Stainless Steel Housing

Corrosion Resistant
Chromium provides for an invisible film that resists oxidation, thus making the material resist corrosion or "passive".

Stainless steel, having a non-porous surface, practically eliminates bacteria growth and other harmful micro-organisms. Easy to clean, which is why it is the first choice in laboratories, hospitals as well as food processing.

Aesthetically Pleasing
Stainless steel has a modern and attractive appeal, is bright, and has an easily maintained surface.

Chronomite Instant-Flow Micro Water Heating
Chronomite Instant-Flow Micro Water Heating Optional finishes
• High Polish
• Satin


Installation Instructions - Low Flow Models
Installation Instructions - Standard Flow Models
Submittal Sheet, Instant Flow Micro, Low Flow (pdf)
Submittal Sheet, Instant Flow Micro, Standard Flow (pdf)
Chronomite Product Line Brochure

Use the Instant-Flow Micro Tankless Water Heater in these applications

Preschools -- Instant, unlimited hot water is very helpful for daycares and preschools. Thermostatically-controlled or Factory-preset models prevent scalding and reduce the spread of bacteria and viruses. Heaters are IAPMO certified to meet the same lead-free mandates as schools, which ensures the safest water possible for children.

Restaurants -- The benefits of Chronomite tankless water heaters are valued in health, food service, and safety environments, among several others.

Pet salons and beauty salons -- Faucets in individual hair-washing sinks can be preset for a consistent temperature that is comfortable and safe for customers. This feature cuts down on time wasted waiting for the water to heat up.

Spa showers and pools -- Instant hot water at perfect temperature is ideal for visitors. Because water is only heated on demand, this unit saves energy by being non-operational when not in use.

Coffee Shops -- Espresso machines can use the preset or thermostatic control feature to keep water at a consistent temperature for beverages. Its compact size makes it ideal for small spaces. Lead-free certification means water is safe to drink.

Lower utility costs for low income housing -- Chronomite tankless water heaters are 99% more energy efficient than standard tank heaters because they only use energy when hot water is streaming through the plumbing. This dramatically reduces hot water delivery time and saves electricity. In warm climates where only a small temperature rise is needed, hot showers are cheaper than ever.

Guest Houses, Luxury Suites, and Kiosks -- Chronomite's space-saving tankless water heater design is easy to conceal anywhere it is needed--perfect for small sinks, dishwashers, wet bars, and other places where space efficiency and aesthetics are important. Remote hot water is even possible for mobile carts in stadiums, amusement parks, and recreation areas.

Emergency safety equipment -- In times of fire, chemical or health risk, water is delivered instantly and at a safe temperature. Drench showers, eye washes, and hoses benefit from a preset temperature and a two-second delivery time. Additionally, the element assembly of a Chronomite heater uses the flow-through abrasive action of water to create a self-cleaning feature that prevents calcification and alkali buildup. These units perform the first time, every single time.

Mop cleaning areas -- Instant hot water delivered conveniently in two (2) seconds, at a temperature that is preset for proper cleaning.

Chronomite Instant-Flow Micro Water Heating

Installs in 15 minutes.

10 easy steps to installing your Chronomite

Remember that proper installation and maintenance of your instant water heater can optimize its energy efficiency and lifespan.

  1. Before starting the installation, turn off the breaker and disconnect the electrical supply to the area. Shut off water supply to the fixture. Double-check that everything has been turned off before proceeding.
  2. Access electrical connections in the unit by unscrewing and removing the front face plate. Keep screw in a safe place.
  3. Mount the unit in preferred location using heavy-duty metal screws, make sure to pull existing electrical wires through supplied hole at the back of the unit. Each of its corner has a mounting bracket.
  4. Connect electrical supply wires to the electrical connections from the unit. Make sure to securely tighten all connections.
  5. Close the front face-plate. Screw securely to close.
  6. Connect the Cold Water supply line from the water source to the bottom Cold/Hot inlet compression fitting opening on the unit. Chronomite Tankless Water Heaters require only one cold water intake. No need for excess lines.
  7. Connect the Hot Water supply line from the top Cold/Hot inlet compression fitting opening on the unit to the sink.
  8. Reopen water supply line to the unit. Turn on sink for 2 to 3 minutes to purge air from the lines (Note: water will not run at temperature until the breaker is turned back on in step #10).
  9. Screw the Flow Control Valve (supplied) onto the faucet/fixture head. An included adapter may be used for an exact fit (each box includes all necessary adapters).
  10. Once air is purged, turn on your breaker. Enjoy your new Chronomite Tankless Electric Water Heater at temperature.
Chronomite Instant-Flow Micro Water Heating

Frequently Asked Questions ("FAQ")

What is the difference between the Chronomite SR series, M Series, and CM series?
The SR series does not automatically adjust (modulate) the output temperature according to changes in flow rate and incoming water temperature. It has one temperature increase amount at a given flow rate, as shown in the specifications. With the M and CM series, the output temperature is modulated to be no more than the factory temperature output setting as indicated in the description and model number after the slash. Please note that this setting is the maximum NOT the MINIMUM output temperature. The CM series has a lower heating turn-on/activation flow rate of 0.2 GPM.

Is it possible to install the Chronomite heater in a vertical position?
Chronomite Tankless Water Heaters are built for horizontal installation. When properly installed, the heater will have the inlet and outlet on the right side of the unit when you are facing it. Installing vertically will risk a burn out of the heating coils and the heater will not be covered by warranty. Please refer to the Installation and Operation sheet for the water heater model you are installing.

I want to plug my Chronomite water heater into a wall outlet. Where is the plug?
Chronomite Tankless Water Heaters are UL listed. This means that the heater is required to be "hardwired" to a dedicated breaker. To gain optimum performance and keep the product under warranty, it must be installed in this manner. Please refer to the Installation and Operation sheet for the water heater model you are installing.

How do I decrease or increase the water temperature flowing out?
As of 2018, The M series Instant Flow Micro have a temperature adjustment knob under the cover.

The hot water maximum flow rate is significantly reduced from my M40L/240. The cold water at the sink has good pressure and flow, but hot water seems like about half that. All of my valves are wide open. Does the M40L have an internal flow restriction?
None of the Chronomite heaters (including the low-flow models indicated by an "L" in the model number) have any internal flow restriction. But the SR and M series models have 3/8" water connections, while most household water supply pipes are 3/4" (twice the size and flow rate). (1/2 inch NPT fittings available with the option in the menu above.)

May I install my Chronomite tankless water heater outside?
Chronomite Tankless Water Heaters are subject to freezing. For outdoor installation, it is recommended that the heater be installed in an enclosure to prevent exposure to the elements. The heater should also be winterized like any other outdoor product that uses water.

Why is my heater tripping the breaker?
Confirm first that the heater has been hardwired to a non-GFI, dedicated breaker. Then check that the breaker size is appropriate for the heater being installed (Example: If it is a 30-amp water heater, a 30-amp breaker is necessary). Please refer to the Installation and Operation sheet for the water heater model you are installing.

Can I install my Chronomite Tankless heater in the ceiling?
Chronomite Tankless Water Heaters are built for point-of-use applications. For optimum use and performance, they should be installed within 18" from the point of use. Please refer to the Installation and Operation sheet for the water heater model you are installing.

Will a Chronomite Tankless water heater supply my whole house?
Chronomite Tankless Water Heaters are built for a point-of-use application. They are not built to provide hot water to a whole house.

What voltage is my heater and is it okay if it doesn’t match?
Chronomite Tankless Water Heaters are volt specific. For optimum performance and use, as well as to maintain warranty, the heater must be wired for the correct voltage. The voltage can be found on the label that is adhered to the unit's front.

What phase are your heaters?
Chronomite Tankless Water Heaters are single phase.

What size copper or flex tubing do I use?
3/8" OD according to the installation instructions. The heater can be fitted with optional 1/2" NPT connections with the option in the menu above.

Are compression fittings supplied with the heater?
Two (2) compression fittings are supplied. They are 3/8" x 1/4" NPT. Optional 1/2" NPT connections are available upon request.

What is the maximum operating temperature?
It is 140°F in compliance with the Underwriter’s Laboratories listing.

Do I need the electricity applied to the heater to know if the heater will turn on?
Chronomite Tankless water heaters are pressure and flow activated. The flow switch makes a faint click sound when the faucet is turned on, with or without electricity.

Are Chronomite heaters ASSE 1070 certified?
ASSE 1070 is a mixing valve code pertaining to water temperature limiting devices. It is designed to limit incoming ultra-high hot water supply temperature (120°F - 180°F) to normal, tempered water temperatures (105°F - 110°F), to minimize scalding risk to the end user. Instantaneous water heaters cannot undergo certifications nor testing to this standard, since Chronomite heaters are built to heat incoming cold, ambient supply water only. As stated by American Society of Sanitary Engineering (ASSE) on their official letterhead, the ASSE standard is for water temperature limiting devices, and the various test procedures of this standard requires that the device must have a hot water inlet, a cold water inlet and a mixed water outlet. This standard is therefore not applicable to instantaneous electric water heaters and as such cannot be subjected to ASSE 1070 tests. We have a letter from both IAPMO and ASSE stating these facts on their respective letterheads. Chronomite has a list of manufactures that are certified for ASSE 1070; the good news is, not a single water heater company is on the list. Of course, the Instant-Temp models and Instant-Flow Micro utilize a microprocessor technology that allows for field-adjustable temperatures or factory preset, and can therefore be deemed as having an "anti-scald feature."

Do Chronomite Instant Flow Micro heaters have the DOE Energy Star label/sheet? Are they compliant with the Federal Trade Commission's Energy Labeling Rule?
Although Chronomite Instant Flow Micro heaters are 99% energy efficient, and do not have these certifications.