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I have a hot water heat system with a gas-fired boiler. Up until now, it was a 1 pump, 1 zone system. A contractor recently installed a 2nd pump to effectively create a 2nd zone, with its own thermostat, etc.
Here's the catch. The zone 2 thermostat only controls the zone 2 pump, NOT the aquastat. So the boiler wasn't firing for zone 2, and it was just pumping cold water. The boiler only fires if zone 1 calls for heat. The contractor's solution is to rewire the aquastat to be always on, IE a warm start always keeping the water in the boiler at 180°. That way, the two thermostats only turn the various pumps on and off always circulating 180° water.
Is this an acceptable solution? The contractor says not to waste money on a $100 relay or control box to keep the boiler as a cold start, and that this setup will use minimal gas to keep the water in the boiler at 180°. What are your opinions?