If water heater rinnai and morco are the commonest fitted, the rinnai is flueless, expensive and now discontinued, Morco d51b, d61b, d61e are all decent machines with spares available from supplier - search Google for "morco products".
All gas appliances must have manufacturers parts fitted and be ce marked, if you describing an old pre-ce urn or Bain marie, and it is faulty you must renew the appliance, this would be cheaper than sourcing a one off burner in any event.
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