There are lots of options. A couple of the more common ones are the deluxe heater and the recirculating heater. The recirculating heater is less complicated and seems to be more readily available used. I went this route with my 1952 and after struggling with a leaking heater core several times I went with a new Brassworks core and fan. I posted about that here https://www.stovebolt.com/ubbthread...rks_Recirculating_Heate.html#Post1011395