I usually just do service type work but I may have a customer who needs to replace a Dunkirk hw boiler. Typical setup, not zoned, nothing unusual, 112,500 btuh input, gas boiler. I don't have any good estimating books for installs, I'm figuring (roughly) 10 hours labor to remove old, haul away and install new, fill, test operation, etc, etc. Sound too low or too high? Thanks.