Marvin 5460 heater not heating any longer

SOURCE: Defective heater

i think you are stuck but if you look around maybe you can find a universal control for your heater.

SOURCE: the heating elements are burnt out. where can I

try this web link look for quartz tubes.
http://www.infraredheaters.com/quartz1.htm

SOURCE: Need Marvin quartz tubes

Marvin Replacement elements are available from Quartz Infrared Inc for $17.95. You can order them directly here:
http://www.quartzinfrared.com/Merchant2/merchant.mvc?Screen=CTGY&Category_Code=Marvin

SOURCE: pluged in but not working only light comes on

I would guess that the element is burned out. As these are a relatively inexpensive item I would not waste a lot of time or effort trying to repair it. I hope this helps you. Thanks

SOURCE: I have model 5460 by

First if you do not have previous electrical experience with heaters refer to an expert otherwise you will spoil the unit more. The problem with your unit is the thermostat it is either not set for your temperature or it is faulty. The thermostat is that component of your unit which regulates if the unit bring out heat or cold. When the thermostat does not function as it should the unit regardless of the wattage. Mostly when a thermostat is faulty the unit is more like not on because the thermostat which is responsible for its functioning is partly out of order.
Best get an expert to check the thermostat connections or replace it completely.
Hope this solution has been helpful?