Dave asked:

I’m considering a deal from my reputable and regular plumber to install a Buderus GB142-24 condensing boiler. This unit is seven months old and had been used in another customers home until that home was enlarged and needed a different size boiler. The plumber says this unit retails for 2900 but will sell it for 2000. I’m assuming this does not include any labor. He is working on a formal bid that I’ve not yet seen.
The rated BTUH input of this unit is about 85,000. I’d like to get a second opinion on the adequacy of this input for my home with two adults and two teens and two bathtubs etc. It will also be used for infloor heat.
All of this will be replacing two A O Smith gas Power Shot water heaters, one used for DHW and one for radiant floors. The one used for DHW went kaput today and that is driving this action.
Thanks- Dave