Hi Rob, sorry for late. It was missed. Actually, we informed you it's 220V voltage before order, and provide you connecting line drawing to show you how to connect 110V voltage. The only thing we made mistake is forgetting equip you with an air switch. If you already bought one, pls let us know the fee, we can deduct it as discount for future possible order or spare parts like the heating pipe. Ok? Sorry again for the inconvenience caused, and still wish to do better cooperation in near future. We will be more careful for following orders. Betty from Suzhou Crown sales1@kscrown.com 0086-18151140103