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Stiebel Eltron Megaboost Water Heater

SKU 524201
Original price $355.98 - Original price $355.98
Original price
$355.98 - $355.98
Current price $355.98
in stock

The MegaBoost is designed to be installed with any domestic hot water tank, new or existing, gas or electric. It will provide more hot water for long showers and shorten the tank's recovery time.

It achieves its boosting effect at 100% efficiency. A 30-gallon tank with MegaBoost installed on the hot water outlet will provide 54% more hot water than the tank will without MegaBoost.

If MegaBoost is installed on the cold water inlet it will provide 71% more hot water. MegaBoost may allow using a smaller tank than a larger one which will save space and save money by preventing the increased standby losses of a larger tank.


  •  More hot water for more showers or longer showers
  •  Achieves its boosting effect at 100% efficiency
  •  Makes a small tank perform like a large tank
  •  Saves space
  •  Fast & accurate hot water temperature adjustment for convenience and comfort
  •  Increases existing tank capacity up to 71%
  •  200% faster recovery time
  •  Saves energy
  •  Saves money by preventing the increased standby losses of a larger tank replacement

Delivery time / Order Processing & Shipping Times

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Model - Item NumberMegaBoost - 524201
Phasesingle 50/60 Hz
Voltage240 V
Wattage9.6 kW
Amperage40 A 
Min. recommended circuit breaker (1) (DP)40 A
Min. recommended wire size (2) (copper8/2 AWG
Min. water flow to activate unit0.264 gpm (1.0 l/min)
Max. inlet water temperature131 °F (55 °C)
Weight5.9 lb (2.7 kg)
Nominal water volume0.13 gal (0.5 l)
DimensionsWidth7 1/8" (20.0 cm)
Height14 3/16" (36.0 cm)
Depth4 1/8" (11.0 cm)
Working pressure150 psi (10 bar)
Tested to pressure300 psi (20 bar)
Water connections½" NPT


1 This is our recommendation for overcurrent protection sized at 100% of load. Check local codes for compliance if necessary. Tankless water heaters are considered a non-continuous load. 

2 Copper must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load. 


Mega Boost Classic Brochure and Sizing Guide

Specifications and Installation Guide

Warranty Information

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