"So many homes now have high efficiency sealed combustion boilers and furnaces that do not vent out through the chimney at rooftop height. These units typically will have their intake and exhaust going out through the side of the house. These do need to be high enough off the ground to allow for typical snow patterns, but snow drifts due to high winds can pile pretty high, and this next storm is coming with very high winds."
"Electric heat pumps are being installed in almost all our residential remodels. There are no dangerous flue gases that can back up with a heat pump but you still need them to be clear of ice and snow. If properly installed, the outside condenser will be on a stand perhaps 16 inches off the ground. The same issue with snow drifts can bury the condenser and cause it to shut down."
More snow is possible, with Cape Cod, the Islands, and southeastern Massachusetts likeliest to see significant accumulations and lighter amounts possible for Greater Boston. High winds can create deep snow drifts that bury sidewall vents and heat pump condensers. High-efficiency sealed-combustion boilers and furnaces often vent through sidewall flues; keeping those flues and intake vents shoveled clear prevents dangerous carbon monoxide backup. Electric heat pump condensers should be kept clear of ice and snow, as burial can cause shutdowns even when mounted about 16 inches above ground. Portable gas generators must be operated outside and well away from houses and windows.
Read at Boston.com
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