Temperature modulated with electronic ignition suitable for heating potable water only - not approved for space heating purposes (intended for variable flow applications) (36 pages)
Flow modulated with hydro-generated ignition suitable for heating potable water only - not approved for space heating purposes (intended for variable flow applications with steady cold water inlet temperatures) (28 pages)
Temperature modulated with electronic ignition suitable for heating potable water and space heating (intended for variable flow applications) (60 pages)