Removed old 150,000 BTU munchkin boiler. Installed new crown velocity 150,000 BTU wall hung boiler. Rehooked up supply and return piping to existing primary secondary piping. Also reused takeover pump on return for boiler. Rehooked up wiring to new boiler rehooked into exhaust piping. Rehooked up gas piping. Purge system and tested. Everything is operational at this time.