Looking to install a gas insert into our zero clearance fireplace to use as a zone heater and reduce our heating costs. The main room is about 28-18 with 10 foot ceilings and is the location of the fireplace. We would like to keep this room warm with a little bit of heat transfered into the master bedroom and kitchen/dining room which are attached (see floor plan). The opening height if our existing fireplace is only 19 inches so we have limited options. We meet with the fireplace store today and they recommended the archgard 22-dv124n. It's output is 17-24k btu per hour. Will this be sufficient to meet our needs? Our quote was 450 for install and 3000 for the insert, liner, surround, required adapters and a thermostat remote. Is this a good price?