The boiler in this church is pretty darn big, as you can imagine. Since it really is three boilers built as one, we shut down the middle third of the boiler and equipped the last section to turn on and off on a vaporstat. This gives the boiler high fire/low fire capability and somewhat compensates for the fact this boiler is big enough to handle not just the church but two other buildings as well. The combination mechanical water feeder/low water cutoff was replaced with separate controls.