I had a 22K Generac installed. Natural gas required another larger pipe installed. Still waiting on the second transfer switch (125 amp) to arrive; the 200 amp came with the generator. Also awaiting city to install larger gas meter at no charge. I tried to talk my way out of the additional gas but the installer was adamant that in order to perform whole house duties the generator needed more volume. I can't see having the pool heater running, using the gas grill etc, etc during an outage but I did specify WHOLE home. $16k and don't know when the 125 amp switch will arrive. City refuses to sign off on another 200 amp switch which is available.