What is KOSHER hot water for Shabbat?

Understanding the halachic principles behind LoftyHeat's innovative technology

The Temperature Scale

COLD WATER
KOSHER WATER
YAD SOLEDET
3°C
37°F
30°C
86°F
45°C
113°F
60°C
140°F

The Halachic Problem

It is well known that using the hot water tap on Shabbos is forbidden.

Here are some of the key reasons:

  • Cooking the Incoming Water
    When hot water is removed from the tank, cold water enters and heats up, which is considered cooking on Shabbos.
  • Automatic Re-Ignition
    Cold water entering the tank will ignite the heating element as it reheats the water.
  • Digital Sensor Response
    Opening hot water triggers the electronic sensors, updating the display and internal settings.
  • Yom Tov Limitation
    Even on Yom Tov, when cooking is allowed, the ignition and sensor concerns remain prohibited.

The LoftyHeat Solution

LoftyHeat is designed to allow hot-water use on Shabbat and Yom Tov. By keeping the tank below yad soledet (the halachic cooking point), controlling ignition so it never reacts to incoming water, and using delayed digital sensors for full halachic compliance.

As a result, when hot water is drawn, the cold water entering is never halachically cooked—only warmed.

Key Halachic Points:

Temperature Control

Water temperature is maintained below 113°F (45°C), which is below the halachic threshold for cooking (yad soledet).

Halachic Compliance

Cold water entering the tank is heated, not cooked, making it permissible for Shabbat use according to Jewish law.

Rabbinic Approval

Endorsed by leading halachic authorities who have thoroughly reviewed the technology and its compliance.

Practical Application

Provides comfortable warm water for dishes, showers*, and daily needs while maintaining full Shabbat observance.

* For those that take showers on Shabbos

How LoftyHeat Works

1

Temperature Monitoring

Digital thermometer continuously monitors water temperature in the tank

2

Automatic Control

LoftyHeat controller maintains temperature below 113°F (45°C) at all times

3

Valve Management

Mashgiach and Autobalance valves control water flow to prevent cooking

4

Safe Usage

Cold water entering the tank is heated, not cooked, making it halachically permissible

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