I'm not up on waterbed heaters. If I put one inside my 7' Valley with 3/4" slate do you think it will help the humidity problem I have most mornings? I can deal with the slow cloth in high humidity but the rails are way to bouncy and short as hell. My table is on patio in screened room. If you think it will help, is a 325 watt one OK? Thank you. Johnnyt