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Safety system for hydronic water heaters and boilers

  • US 4,944,253 A
  • Filed: 10/10/1989
  • Issued: 07/31/1990
  • Est. Priority Date: 10/10/1989
  • Status: Expired due to Fees
First Claim
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1. An electrical safety system for shutting off all elements of a water heating device, wherein the electrical safety system comprises:

  • a water heating device having a tank for heating water, a means for heating the water, a water supply means feeding into the tank, a hot water distribution system leading from the tank, an overflow drain connected to the hot water distribution system and a power supply means feeding the means for heating the water;

    a water collecting means comprising a water proof sheet of material having a shallow collecting basin on a portion of the sheet, wherein the water collecting means is placed under the tank of the water heating device for collecting any water which leaks from the water heating device;

    a water sensing means comprising low power electrical contacts sensitive to water on the sheet within the shallow collecting basin for detecting any water which begins to accumulate within the collecting basin, wherein the electrical contacts are elevated above the sheet to a level which is below the height of the shallow collecting basin;

    a normally open valve connected to the water supply means, which normally open valve closes to shut off the supply of water when the water sensing means detects water in the water collecting means;

    a means for preventing backflow of hot fluid connected to the hot water distribution system;

    a power shut-off means attached to the power supply means and electrically connected to and activated by the water sensing means;

    an outflow pipe leading out of the water tank and, connected to the water sensing means, a means for activating an outflow of water out of the tank into the outflow pipe upon detecting water in the water collecting means;

    an extension of the overflow drain into the water collecting means.

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