Heater

Abstract

A heater, comprising a fuel burner, a primary heat exchanger, and an enclosure around the fuel burner and primary heat exchanger and defining a gas flow path, wherein the enclosure further comprises a secondary heat exchanger and/or heat storage means.

1 . A heater, comprising
 a fuel burner,   a primary heat exchanger, and   an enclosure around the fuel burner and primary heat exchanger and defining a gas flow path,   wherein the enclosure further comprises a secondary heat exchanger and/or heat storage means, and a volume within the enclosure is filled and/or replenished by condensate or grey water.   
     
     
         2 . A heater as claimed in  claim 1 , where the enclosure contains a material undergoes a phase change between 20° C. and 60° C. 
     
     
         3 . A heater as claimed in  claim 2 , wherein the enclosure defines a second chamber adjacent a first chamber, wherein the first chamber defines the volume filled with condensate or grey water, and the second chamber contains the phase change material. 
     
     
         4 . A heater as claimed in  claim 3 , in which the first chamber is open at its top to receive condensate from the exhaust gases from the boiler. 
     
     
         5 . A heater as claimed in  claim 1 , in which an outer wall of the enclosure is non-metallic. 
     
     
         6 . A heater as claimed in  claim 5 , in which the outer wall is formed from one or more of plastics, resin impregnated fibre, cloth, and synthetic materials. 
     
     
         7 . A heater as claimed in  claim 1 , further comprising a internal tank of potable water. 
     
     
         8 . A heater as claimed in  claim 7 , in which the tank of potable water is connected in series with a liquid flow path in the enclosure. 
     
     
         9 . A heater as claimed in  claim 1 , further comprising a valve for blending water that has picked up heat from the enclosure with water from a cold main to produce warmed water for supply to the primary heat exchanger. 
     
     
         10 . A heater as claimed in  claim 1 , in which the enclosure is held on an attachment which releasably engages with a cooperating member on the boiler. 
     
     
         11 . A heater, comprising a fuel burner, a primary heat exchanger, and a chamber surrounding the burner and heat exchanger and filled with a fluid so as to limit a maximum temperature at an outer wall of the heater, said outer wall being made of a non-metallic water proof material.