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A radiant gas burner within the combustion chamber of a water heater has a pilot flame created using a raw fuel jet that impinges on an interior surface portion of a flame holding outer burner wall portion, representatively of a metal wire mesh material, and is mixed within the burner with combustio

A radiant gas burner within the combustion chamber of a water heater has a pilot flame created using a raw fuel jet that impinges on an interior surface portion of a flame holding outer burner wall portion, representatively of a metal wire mesh material, and is mixed within the burner with combustion air delivered thereto from outside the combustion chamber. The resulting fuel/air mixture passes outwardly through the impinged upon mesh wall portion, which functions as a pilot flame stabilizing structure, and is ignited to form a pilot flame on the exterior of the burner body. A thermocouple portion of a clogging detection system senses a change in the pilot flame shape caused by particulate clogging of the metal mesh material and responsively terminates further gas supply to the water heater.

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What is claimed is: 1. Combustion apparatus comprising: a wall structure defining a combustion chamber; a main fuel burner disposed within said combustion chamber; a pilot flame stabilizing structure disposed within said combustion chamber; fuel delivery apparatus operable to receive fuel from a s

What is claimed is: 1. Combustion apparatus comprising: a wall structure defining a combustion chamber; a main fuel burner disposed within said combustion chamber; a pilot flame stabilizing structure disposed within said combustion chamber; fuel delivery apparatus operable to receive fuel from a source thereof and discharge the received fuel in the form of a fuel jet that impinges against said pilot flame stabilizing structure; and air delivery apparatus through which combustion air from outside said combustion chamber is flowable to the discharged fuel jet to form therewith a fuel/air mixture ignitable to create a pilot flame extending outwardly from said pilot flame stabilizing structure. 2. The combustion apparatus of claim 1 wherein: said pilot flame stabilizing structure is defined by a portion of said main fuel burner. 3. The combustion apparatus of claim 2 wherein: said pilot flame passes through said portion of said main fuel burner. 4. The combustion apparatus of claim 3 further comprising: a clogging detection system operative to sense a change in the shape of said pilot flame indicative of clogging of said main fuel burner and responsively prevent further generation of said pilot flame. 5. The combustion apparatus of claim 4 wherein: said combustion apparatus further comprises a fuel valve operative to selectively permit fuel, from a source thereof, to flow through said fuel delivery apparatus, and said clogging detection system includes a thermocouple positioned to be impinged by said pilot flame and operative to close said fuel valve when said change in the shape of said pilot flame occurs. 6. The combustion apparatus of claim 2 wherein: said main fuel burner is a radiant fuel burner. 7. The combustion apparatus of claim 1 wherein: said combustion chamber is a water heater combustion chamber. 8. A method of creating hot combustion products in the combustion chamber of a fuel-fired heating appliance, said method comprising the steps of: positioning a pilot flame stabilizing structure within said combustion chamber; positioning a main fuel burner within said combustion chamber; creating within said combustion chamber a fuel jet which impinges upon said pilot flame stabilizing structure; mixing air from outside said combustion chamber with said fuel jet to form therewith a fuel/air mixture; and igniting said fuel/air mixture to create a pilot flame extending outwardly from said pilot flame stabilizing structure and useable to ignite a fuel/air mixture subsequently supplied to said main fuel burner. 9. The method of claim 8 wherein said method further comprises the step of: utilizing a wall portion of said main fuel burner as said pilot flame stabilizing structure. 10. The method of claim 9 wherein: said wall portion of said main fuel burner has discharge openings therein, and said method further comprises the step of causing said fuel/air mixture to flow outwardly through said discharge openings, and said igniting step is performed in a manner causing said pilot flame to form on an outer surface of said wall portion of said main fuel burner. 11. The method of claim 10 further comprising the step of: sensing a change in the shape of said pilot flame indicative of clogging of said main fuel burner and responsively preventing further generation of said pilot flame. 12. The method of claim 11 wherein: said sensing step includes the step of causing said pilot flame to impinge upon a thermocouple. 13. The method of claim 12 wherein: said responsively preventing step is performed by preventing said creating step from being performed. 14. The method of claim 8 wherein: said step of positioning a main fuel burner within said combustion chamber is performed by positioning a radiant fuel burner within said combustion chamber. 15. The method of claim 8 wherein: said mixing step is performed within an interior portion of said main fuel burner. 16. The method of claim 15 wherein: said mixing step includes the step of flowing air from outside said combustion chamber through an enclosed path into said interior portion of said main fuel burner. 17. A fuel-fired heating appliance comprising: a combustion chamber thermally communicatable with a fluid to be heated; a main burner disposed within said combustion chamber; and a pilot burner structure disposed within said combustion chamber for igniting said main burner and including: a flame stabilizing structure disposed within said combustion structure; fuel delivery apparatus operable to receive fuel from a source thereof and discharge the received fuel in the form of a fuel jet that impinges against said flame stabilizing structure; and air delivery apparatus through which combustion air from outside said combustion chamber is flowable through an enclosed flow path to adjacent the discharged fuel jet to form therewith a fuel/air mixture ignitable to create a pilot flame extending outwardly from said flame stabilizing structure. 18. The fuel-fired heating appliance of claim 17 wherein: said fuel-fired heating appliance is a fuel-fired water heater. 19. The fuel-fired heating appliance of claim 18 wherein: said fuel-fired heating appliance is a gas-fired water heater. 20. The fuel-fired heating appliance of claim 17 wherein: said main burner has an outer wall portion with fuel/air discharge openings therein and interior and exterior surfaces, part of a section of said outer wall portion defining said flame stabilizing structure, with said fuel jet impinging on the interior surface of said part of said section and said pilot flame extending outwardly from the exterior surface of said part of said section. 21. The fuel-fired heating appliance of claim 20 wherein: said outer wall portion of said main burner is of a metal mesh construction. 22. The fuel-fired heating appliance of claim 20 wherein: said main burner is a radiant fuel burner. 23. The fuel-fired heating appliance of claim 20 further comprising: a clogging detection system operative to sense clogging of said fuel burner and responsively prevent further generation of said pilot flame. 24. The fuel-fired heating appliance of claim 23 wherein: said clogging detection system is operative to sense a change in the shape of said pilot flame indicative of clogging of said main burner. 25. The fuel-fired heating appliance of claim 24 wherein: said fuel-fired heating appliance further comprises a fuel valve for selectively supplying fuel to said fuel delivery apparatus, and said clogging detection system further includes a thermocouple electrically coupled to said fuel valve and positioned to be impinged upon by said pilot flame. 26. The fuel-fired heating appliance of claim 20 wherein: said section of said outer wall portion of said main burner is more susceptible to clogging by particulate matter than the balance of said outer wall portion of said main burner. 27. The fuel-fired heating appliance of claim 26 wherein: said outer wall portion of said main burner is of a mesh construction, and the mesh spacing in said section of said outer wall portion is smaller than the mesh spacing in the balance of said outer wall portion. 28. Fuel combustion apparatus comprising: a hollow burner body having an outer wall portion with fuel/air discharge openings therein; a fuel delivery tube extending into the interior of said burner body, said fuel delivery tube being operative to receive pressurized fuel from a source thereof and discharge from an opening therein a fuel jet which impinges against the interior surface of said outer wall portion; and an air delivery conduit extending into the interior of said burner body and operative to deliver combustion air from a source thereof to the discharged fuel jet to form therewith a fuel/air mixture passing outwardly through discharge openings in a section of said outer wall portion and being ignitable to form a pilot flame extending outwardly from said outer wall portion. 29. The fuel combustion apparatus of claim 28 wherein: said burner body is a radiant fuel burner body. 30. The fuel combustion apparatus of claim 28 further comprising: a clogging detection system operative to sense clogging of said discharge openings and responsively prevent further generation of said pilot flame. 31. The fuel combustion apparatus of claim 30 wherein: said clogging detection system includes a thermocouple positioned to be impinged upon by said pilot flame and operative to output a signal indicative of an undesirable shape of said pilot flame. 32. The fuel combustion apparatus of claim 30 wherein: said fuel jet impinges on a part of a section of said outer wall which is more susceptible to particulate clogging than the balance of said outer wall. 33. The fuel combustion apparatus of claim 32 wherein: said outer wall is of a mesh construction, and said section of said outer wall is of a finer mesh construction than the balance of said outer wall.