Uninterruptible Power Supply

[Enigma]

I'm looking for a UPS that will power a 31 watt pump (constantly) and a 50 watt heater (on and off), for as long as possible. I think the longest the power has been down for us in this house was around 4 hours.

I don't need anything with a bunch of fancy displays and options. I'm just looking for an abundance of clean power that won't break the bank.

Options? Ideas? Suggestions?

thx!