I'm replacing my cast iron boiler for hydronic heating and domestic hot water in Massachusetts. Plans are to install a new Viessmann gas fired condensing boiler. Living in New England, it's not out of the question that we could lose power during a winter storm. I'd like to be able to keep the house warm during an extended power outage. The power requirements of the boiler and circulating pumps is going to be relatively low, so I'm looking at installing a furnace transfer switch to be able to power the furnace off a portable inverter generator that I own.
- Furnace transfer switch: https://www.homedepot.com/p/Reliance-Controls-Furnace-Transfer-Switch-TF151/202216476
- Champion 2000W inverter generator: https://www.championpowerequipment.com/product/73536i-2000-watt-inverter-generator/
Am I risking my boiler equipment? I understand that a standard job-site generator kicks out some really dirty power, and I shouldn't plug in anything with a chip in it. But everything I've read about inverters is that they're electronics and computer safe. I'd like some thoughts if there's any thoughts or experience on this that I've missed.
I've also heard the advice, install a whole house system or an installed system serving only a couple of breakers. That's really overkill for what I'm looking for. There's nothing else in the house that I'm worried about running that can't be fed off the second outlet of the generator (an LED light and maybe a phone/laptop charger). I own the generator already, and we don't lose power frequently enough to justify an installed system.
Are there any issues with powering on/off the Viessmann boiler system. I understand the recommended sequence for plugging into a generator are to 1) get the genset started, 2) plug in the equipment. Then on the shutdown 3) unplug the equipment, 4) shutdown the genset. Is pulling power from the Viessmann going to be bad for it in some form? Again, this is not going to be a standard operating mode, but hopefully coasting through an emergency couple of days. But last thing I want is to damage my boiler during a couple of hour power outage, requiring an emergency service call once power comes back on.
Finally, I'm aware of carbon monoxide risks, and I have the requisite 50ft extension cord to put the genset outside, 20ft from the house.
Thoughts, hand-holding? Thanks.