ES27-D

27 kW High-Flow Electric Tankless Water Heater

High-Flow Whole-Home Performance

For larger homes, multiple fixtures, and light-commercial applications when properly engineered. Wi-Fi enabled for remote temperature monitoring and control.

27 kWPower / Output

240VEnergy source / Voltage

3 × 40A double-pole dedicated breakersBreakers / Circuit protection

3 × 40A double-pole dedicated breakers

3 sets of 8 AWG copper: red + black + equipment groundWire / Conductors3 sets of 8 AWG copper: red + black + equipment ground

3/4-inch male NPT water inlet and outletWater connections

3/4-inch male NPT

0.32 GPM activation • 2.9–87 PSIFlow / Performance

FROM DEMAND TO DEPENDABLE HOT WATER

Engineered as a complete solution.

Every successful installation begins with the application and ends with verified performance.

Hot Water on Demand

Energy is used when water flows—without storing a tank of heated water.

Application-Based Sizing

Match incoming temperature and simultaneous GPM to the correct output.

Professional Verification

Confirm electrical service, breakers, conductors, plumbing and installation requirements.

Drakken Support

Approved documents, registration and warranty resources help protect the installation.

Designed around the demand

Ideal Applications

Higher-output solutions for demanding residential and professionally engineered light-commercial applications.

Large Residences

Commercial Kitchens

Multi-Bath Homes

Commercial Utility

Installation Materials & Verification

Use this visual guide to identify the general type and quantity of major installation items. The approved manual, rating label and local code control the final installation.

Circuit protection

3 × 40A double-pole dedicated breakers

Copper conductors

3 sets of 8 AWG copper: red + black + equipment ground

Connection fittings

3/4-inch male NPT water inlet and outlet. Use correctly sized female NPT fittings to connect to male NPT heater ports where applicable.

3/4-inch male NPT

Electrical

Dedicated overcurrent protection, copper conductors, grounding, disconnecting means, panel capacity, and any required GFCI protection must match the current approved manual and local code.

Plumbing

Operating requirement: 0.32 GPM activation • 2.9–87 PSI

Provide approved water shutoffs, correctly sized connections, pressure control where required, and adequate access for installation and service.

A licensed professional must verify the rating label, current installation manual, energy supply, water conditions, and applicable codes before purchase or installation.

Temperature Rise & Sizing

Outlet temperature equals inlet temperature plus the heater’s estimated temperature rise at the selected flow. Compare every electric model in this series below, then use the sizing tool and current approved documents to confirm the application.

Model	0.5 GPM	1 GPM	1.5 GPM	2 GPM	2.5 GPM	3 GPM	4 GPM
ES18-D	246°F rise	123°F rise	82°F rise	61°F rise	49°F rise	41°F rise	31°F rise
ES27-D	368°F rise	184°F rise	123°F rise	92°F rise	74°F rise	61°F rise	46°F rise

Planning reference calculated from rated electrical input, not a certified performance curve. Actual temperature rise varies with voltage, efficiency, inlet temperature, pressure, installation, and operating conditions. Confirm final sizing with approved manufacturer data.

Use the Sizing Tool

PATENT PENDING • THE DRAKKEN DIFFERENCE

Water and heating elements follow separate paths.

Move beyond exposed screw-plug elements

Drakken’s water-isolated heat-transfer design keeps the water path separated from the heating elements. The engineered exchanger transfers heat without relying on direct water-to-element contact or repeated flash heating at exposed elements.

This approach is designed to reduce dry-fire exposure, calcium contact at the elements, inconsistent outlet temperatures, and recurring screw-plug element replacement.

Five years of replacement confidence

Qualifying registered products are backed by a 5-year replacement warranty. After year five, coverage may be eligible for paid reactivation with Drakken approval under the current written warranty terms.

Proper sizing, licensed installation, registration, proof of purchase, and all published warranty requirements apply.