Size + Brand Power Vent Gas Water Heater - 3 Units

[Eric La Pratt]

What brands of power vent water heaters do you recommend? Not seeing great reviews on AO Smith (Lowes), Rheem (Home Depot + a knock off at Menards). Is Bradford White good?

How many gallons should I get? Currently have 75 - no idea how well it worked before. Is that enough? It's a big jump in price to 80 or 100 gallons.

Situation: I am finishing an almost-gut rehab on 3 units in Chicago. We didn't intend to replace the 75 gallon water heater but then the basement flooded during construction and the heater is done. I want to get away from the using the chimney and am thinking of power vent (don't ask why, but let's just say I'm not 100% confident on its ability long term and it's not something that can reasonably be lined).

Usage Specifics: Single shared water heater (owner pays for this gas supply separately); 3 units (floors 1 - 3); 8 Bedrooms (3 + 3 + 2); 3 dishwashers; shared laundry in basement.

Thanks all!