Also, Vancouver’s current building-bylaw, VBBL 2022, doesn’t outright ban the use of gas space and water heating. There’s an option to use whatever space and water heating system as long as the GHG intensity of the home is below a certain level. However, it may not be possible to get the GHGI level low enough depending on the home being built.

Lastly, all new homes will likely having air conditioning. I believe that this becomes mandatory in new buildings in Vancouver in 2025. So if the home has an air conditioner, then it has a heat pump to provide heating (getting an air conditioner to heat in the winter only requires a minor modification). So how is then installing a gas boiler saving money? Basically, the home will have two heating systems.

This is what I came to post.
There is no gas without electricity for most appliances. You can use batteries to power the igniter in newer gas fireplaces but for the most important appliances: water heaters, furnaces, boilers and gas stoves if there is no electricity the appliance will not function.