There are many ways to heat sake.  You can put a tokkuri filled with sake into a microwave oven for approximately 60 seconds; you can place your tokkuri into a pot half filled with water and heat it on a stove - old school but takes more time; or you can try modern style and use a sake heater. Nothing wrong with any way you heat sake.

Sake Warmer Twinbird Tw 4418b Osake Kan Portable Machine (Kitchen)

New From: $83.00 USD In Stock
Used from: $53.97 USD In Stock

Electric Sake Warmer Genuine Mino Ware Minoyaki (Kitchen)

List Price: $2,557.60 USD
New From: $2,557.60 USD In Stock
Used from: Out of Stock