Desa International was the manufacturer of
Dayton- older American made models only
and many private label brands
Desa international filed bankruptcy in December 2008 and is no longer in business.
http://www.desatech.com/ is an information site for products manufactured by Desa prior to 2009. This site has owner’s manuals and tech tips that were written by Desa prior to their bankruptcy. You can also find links to purchase parts for Desa product.
www.reddyparts.com is a source of parts for heaters manufactured in the US by Desa International, and also has valuable troubleshooting and servicing information, parts lists for all models, and necessary tools such as the low pressure air gauge for setting the air pressure from the pump (heater will not work properly if the air pressure is not correct).