alright, im using a $10 light dimmer for my bp's tub and im glad to have it and it helps alot, but it seems like there is never a constant temp for more than 30 mins- 1hr, the temp is either always climbing or falling, i can never get it to stay! Even when the temps in my house are constant. I am using an Acu-rite thermostat. Is there any kind of two-in-one thing that you can program to a certain temperature and have the uth stay at that temp constantly?

It would be like a thermostat/lightdimmer combo.

Anyway the least expensive would be best but im willing to spend more if necessary.