Yeah, it's a really, really nice, top-of-the-line, high-end battery. If you're running lots of stuff it's the battery to have. But for just an Espar heater and maybe a few small inverter loads, a cheap "marine" or "truck" battery is all you need. Just don't try to use a regular car cranking battery, since those aren't designed for the small continuous amp draws. A marine battery (truck battery is identical except for the terminals) is designed for the low amp draws of a trolling motor and running lights, which is the same amp draw of an Espar heater. Perfect fit for each other.