The whole point is I don't want my pumps running at a lower rate! In a power outage, I especially want the surface agitation for oxygen exchange. Without oxygen exchange the flow is not nearly as helpful. At 25 percent there would be not be any significant oxygen exchange.It is not debatable that a pump running at 5 watts will last longer than one running at 10 watts. However, the ecotech backup will automatically change the power setting of the pump to run slower. A UPS will not. It's a very valid test of what would happen if the power was lost and you were not there or didn't know about it.
Unless you have a massive battery system, you really shouldn't count on an automatic battery backup for any other equipment. If you're able to maintain your tank in a power outage, a generator or other more manual options is going to be a lot better than putting a heater or most other equpiment on a UPC.
I agree a generator is really needed to run heaters long term and a battery or UPS is a poor solution for them.