Bosch Greenstar 151 Combi Boiler
Bosch Greenstar 151 Combi Boiler Review
The Bosch Greenstar 151 is a residential combination boiler — 151,000 BTU input providing both space heating and domestic hot water. Bosch's mid-size combi entry, sized for medium-sized homes (1,500-2,500 sq ft).
Specs: 151,000 BTU input, AFUE 95% (condensing), 4.5 GPM DHW at a 70°F rise, modulating burner with 5:1 turndown ratio. Stainless steel heat exchanger. PVC condensing venting. 15-year warranty on heat exchanger.
The Greenstar 151 sits below the Greenstar 200 in capacity. Right answer for medium-size homes with modest hydronic space-heat demand combined with typical residential DHW needs.
About $7,500-$10,000 installed depending on hydronic system modifications. Bosch's service network is smaller than Navien or Lochinvar in the US — verify dealer presence in your market before specifying. Right buyer: medium home replacing aging boiler + water heater in markets with established Bosch dealer presence.