Home Systems

How to size a ventless gas heater by BTU and room volume, blue flame versus infrared, the states where they are banned, and the safety rules that actually matter.

Running watts versus starting watts, realistic household loads, inverter versus conventional, and the carbon monoxide rules that matter. How to size a home backup generator.

What NPE, NCB and NFB mean, how to size a Navien by flow rate and climate, and which model fits your home. A plain guide to choosing a tankless water heater.