Hi, !
I know quite a few of our members use of have used paraffin wax heaters and I hope they see your question and chime in with their personal recommendations. There are a *lot* of options out there, so I know it might be helpful to narrow done your options. I know that the Homedics brand is used by at least one member, here. And, it's pretty affordable. I have not used it myself, so please keep that in mind.
If you don't get a lot of feedback, I like to go to Amazon and just read reviews on some of the most popular products. It tends to help me get an idea of the pros and cons of a product, even if I choose to buy it from somewhere besides Amazon.
I hope this helps and that you find the right wax heater for you!
Best, Erin, RheumatoidArthritis.net Team Member.