Fostoria no longer manufactures the FHK Series Portable Job Site Heater with metal elements:
https://morelectricheating.com/products/MANUFACTURERS/FOSTORIA/FHK%20SERIES%20PORTABLE%20JOB%20SITE%20HEATER.aspx
Qmark makes a similar product:
https://morelectricheating.com/products/MANUFACTURERS/QMARK/ARL.aspx
here are the part #’s:
QMARK685360143606 ARL1511 Portable Radiant Heater
Alternate for FOST881715 FHK-212-1CA 120V 1.8kW Portable Heater
QMARK685360143620 ARL2021 Portable Radiant Heater
Alternate for FOST881739 FHK-224-1A Fostoria Portable
QMARK685360143644 ARL2041 Portable Radiant Heater
Alternate for FOST881753 FHK-248-1A Fostoria Portable
QMARK685360143675 ARL4521 Portable Radiant Heater
Alternate for FOST881784 FHK-424-1A Fostoria Portable
QMARK685360143699 ARL4541 Portable Radiant Heater
Alternate for FOST881807 FHK-448-1A Fostoria Portable
QMARK685360143255 BRM6023 Qmark Radiant Heater & QMARK685360143385 BRM60 Rollaround Cart
Alternate for FOST882910 FHK-624-3A Portable Electric Radiant Htr
QMARK685360143255 BRM6043 Qmark Radiant Heater & QMARK685360143385 BRM60 Rollaround Cart
Alternate for FOST882934 FHK-648-3A Portable Electric Radiant Htr
QMARK685360143286 BRM13523 Qmark Radiant Heater & QMARK685360143392 BRM135 Cart For 13.5KW Heater
Alternate for FOST882965 FHK-1324-3A Fostoria Portable
QMARK685360143309 BRM13543 Qmark Radiant Heater & QMARK685360143392 BRM135 Cart For 13.5KW Heater
Alternate for FOST882989 FHK-1348-3A Fostoria Portable 13.5 kW