Protect your furniture and floors, from damage, by using a vinyl stand-up safety liner to contain the water when your mattress springs a leak. Just place the rigid stand-up safety liner in your wood frame on top of your heater's pad.  Next place your waterbed mattress inside the liner and fill with water. Do not fill the waterbed bladder above the vinyl safety liner.

Hardside Waterbed Liners
1-800-883-8828