Indoor fireplaces were once available in two categories: real or faux. The real ones were the cozy brick models that burned logs and necessitated soot-cleaning chimney sweeps. And the faux ones - with their smoke-free, simulated flames and ceramic logs - were so unconvincing, they often ventured into the realm of tacky. Today, both styles still exist, but homeowners have enjoyed a much broader range of options for the past decade - from new eco-friendly mobile units to energy-efficient upgrades for their classic fireplaces. There are wood burning, gas, electric and alternative fuel varities now that there is a massive demand for versatile, interior fire features.