Depending on the type of gas appliance, it typically costs between $100 and $300 to have one installed. For example, a gas water heater typically costs around $200 to install, while a gas furnace typically costs around $275.

It can cost anywhere from $100 to $1,000 to have a gas appliance installed, depending on the complexity of the installation. For example, if you need to have a gas line run to your home or if you need a new chimney liner installed, the cost will be higher than if you just need an appliance hooked up to an existing gas line. For basic appliance installation, most professionals will charge around $50-$75 per hour. So if it takes them 4 hours to install your appliance, that would be around $200-300. However, there may be additional fees for things like permits and/or gas line hookups. Always ask for a written estimate before agreeing to have any work done.