Flip-up burner access makes periodic inspection, adjustment and electric eye cleaning easy and non-invasive. Because the ceramic combustion chamber linings wear over time, a bolt-on fire box provides the easiest available access for inspection or replacement of the fire box lining. A standard fuel pressure gauge eases troubleshooting. The new self-priming burner minimizes downtime and eliminates the need to bleed the burner should fuel be depleted.