I have a hot water on demand unit so there is no drain valve. Standard water heaters will have a drain valve (often white plastic) that can be removed to drain the tank.
Do not bypass a tankless heater! Ours was installed aftermarket so it has the bypass valves. You want the antifreeze going in to the copper coils on a tankless unit.
I have a hot water on demand unit so there is no drain valve. Standard water heaters will have a drain valve (often white plastic) that can be removed to drain the tank.
Do not bypass a tankless heater! Ours was installed aftermarket so it has the bypass valves. You want the antifreeze going in to the copper coils on a tankless unit.