3 Located in Cambridge, Mass., Graystone installed its original boilers during the 1970s. One of the downsides of operating atmospheric gas boilers is the inability to properly control fuel and air. Because of their significant intake of O2, these boilers require excessive use of fuel to counteract the intake –– without enough fuel the boiler is at risk to “blow out.” The nine inefficient, gas-fired Hydrotherm atmospheric boilers were replaced wi

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