The original Pactrol P14 metal clad sequence controller is no longer available for the older range of ER22 and ER38 radiant tube heaters (c1979 - 1983). Part No. 2000 has been replaced by part No. 2015-P14KIT.
Is the Pactrol P14 sequence controller part No. 2000 still available?
Looking to upgrade your old heater? Look here for information on which product is the best like-for-like replacement.