How much space does 28,000 BTU heat?

Roughly a mid-size room of about 700 to 1,000 square feet in a moderate climate, depending on insulation and layout. It is not sized to heat a whole floor or an open-plan great room on its own.

Does the Valor G4 need a chimney?

No. It is a direct-vent unit, so it vents horizontally through a wall or vertically through the roof with its own termination kit. That makes it usable where a traditional chimney is missing or unusable.

Can it be installed in a bedroom or basement?

Direct-vent gas fireplaces are commonly installed in bedrooms and basements because they use outside air for combustion. Check local code and the manufacturer's clearances before planning the location.

Is a blower or fan included?

The listed specs show no blower. Heat is delivered mainly by radiant and convective flow from the firebox, so a fan kit, if offered for this model, would need to be added separately.

What maintenance does a gas insert need?

An annual inspection of the venting, burner and gas connections is standard. The glass and logs need occasional cleaning, and the vent terminal should be kept clear of debris and snow.