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Water heater control system

  • US 4,166,944 A
  • Filed: 07/25/1977
  • Issued: 09/04/1979
  • Est. Priority Date: 07/25/1977
  • Status: Expired due to Term
First Claim
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1. A water heater control system comprising:

  • (a) a water heater with a heating means and having a hot water outflow line and a cold water inflow line;

    (b) an adjustable water temperature control device operatively connected to said water heater for controlling operation of said heating means;

    (c) first temperature sensing means disposed in operable proximity to said outflow line and responsive to the temperature of said outflow line;

    (d) a second temperature sensing meand disposed in operable proximity to said inflow line and responsive to the temperature of said inflow line;

    (e) electrically operated water temperature control device setting means electrically coupled in circuit with both of said temperature sensing means and mechanically coupled to said water temperature control device, said setting means being,(i) operable for setting said control device in an elevated temperature mode in response to the temperature in said outflow line reaching a predetermined low and the temperature in said inflow line dropping below a predetermined low; and

    (ii) operable for setting said control device in a reduced temperature mode in response to the temperature in said inflow line exceeding said predetermined low and the temperature in said outflow line exceeding a separately predetermined level above said predetermined low.

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