Chronomite ER
1 UEF DOE CCD · 2026-09-19Grade C: where this UEF sits among the 271 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
An electric tankless unit, very small draw pattern (small units - a single bathroom, or a point-of-use heater under a sink).
Checking the Chronomite ER? At the very small draw pattern, the standard daily hot-water usage DOE tests against, it uses 591 kWh of electricity a year. That is 24 kWh below the class median of 615 kWh, and 2nd lowest of 271 models.
Energy use per year
591 kWh a year
Computed by this site from the registry's UEF and the federal test's daily hot-water draw for this draw pattern. What it costs depends on the electricity rate where you live.
That is below the median of 615 kWh for the 271 models registered in the same heater type and draw pattern; it ranks 2 of 271, lowest energy first.
Solid line: this model (591 kWh). Dashed line: the class median.
Min 562 kWh Median 615 kWh Max 649 kWh
What it costs to run where you live
What the registry files
- UEF (Uniform Energy Factor) how much hot water you get for each unit of energy the heater uses
- 1 DOE CCD · 2026-09-19 Compared only with other models registered as an electric tankless unit at the very small draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- Very small DOE CCD · 2026-09-19
- Maximum Gallons Per Minute how many gallons a minute it can heat while running continuously
- 1.5 gal/min DOE CCD · 2026-09-19
What it costs to install
Not published: Installed cost range
This model's UEF lies outside the range NLR REMDB's cost model was fitted on, and the range is not stretched past it.
The annual energy figure on this page does not depend on this range and is unaffected.
Safety record
No CPSC recall names this model.
Checked against the CPSC recall database. CPSC does not publish a model-level match for this product category, so this list is curated by hand from the manufacturer's recall filings.
CPSC · 2026-09-24What these figures mean
How this compares
The closest models in the same class — same fuel, type and draw pattern.
Keep going
How every figure on this page is calculated
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Find what replaces your water heater
Enter the model number off your old unit and see what is on file today, with the yearly cost difference.
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Find a water heater that fits
Three questions — fuel, hot water need, install space — narrow every model on file to the ones that fit.
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What a water heater costs to run
Prices a unit's efficiency against your own utility's filed tariff for your ZIP code.
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How to size a tankless water heater by GPM
Answered from what models in this size actually file.
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Water heaters
Every model on file with the Department of Energy, by heater type.
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All electric tankless water heaters
Electric instantaneous units, sized by flow rate rather than tank gallons.
UEF 1 · Grade C Price it on your ZIP
The figure of 591 kWh is computed by this site, not published by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, which is 1 for this model, with the daily hot-water draw the DOE test assigns to the very small draw pattern. The source is DOE CCD, retrieved 2026-09-19. The number therefore holds only at that test draw. A household that draws more or less hot water will use different energy, and this page gives no estimate for those cases. The registry also lists a maximum flow rate in gallons per minute of 1.5. The full calculation is set out in the annual cost methodology.
The Chronomite ER is 24 kWh below the class median of 615 kWh. Its rank of 2nd lowest of 271 places it in the lowest quarter of its class for energy use. The class is the electric tankless units registered at the very small draw pattern, which means small units: a single bathroom, or a point-of-use heater under a sink. The figure applies to that kind of use. It says nothing about a unit serving several fixtures at once, because the data here covers only the very small draw pattern. For a larger load, the water heater selector filters by fuel, space and size. To compare against a unit in the same class, find a same-class replacement by model number.
The running cost depends on your own electricity rate, so no cost is written in this text. Multiply 591 kWh by your utility's price per kilowatt-hour to check it by hand, keeping in mind that the result applies only at the very small draw pattern. The cost calculator does this from your ZIP using the local tariff. An installed price range is not published for this model. Its ratings lie outside the range the cost database's model was fitted on, and the range is not stretched past it. The registry data used here does not include installation cost, so any figure for it is unknown.
DOE CCD · 2026-09-19