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Constant problems with Bosch Greenstar propane combi boiler

Stephen Beck
4 years ago
last modified: 4 years ago

We had a Bosch Greenstar condensing 151,000 BTU propane combi boiler/water heater (model #FS151) installed less than 2 years ago - a brand new system in our old 1850's farmhouse. This supports the forced air heating system for our main floor.

In the past year and a half - last winter, and this winter - we've had non stop issues with the system.

We use a Nest thermostat to control heat while we are away from the house, or when we have guests staying there.

Right now, the Nest app is showing the heat set to 80 degrees but the room temp not rising above 60.

What tends to happen is the system blows cool air for a long period of time (more than an hour usually) which in turn cools down the house instead of heating it up.

The company that installed it also provides our propane. We have had them out no less than 6 times over the past year and a half to fix it - each time they fiddle with a few things and then it starts working again... for a period of time. But it never seems to actually solve the issue long-term.

Most recently they replaced a valve on the back of the unit. The invoice was over $300. This appeared to correct the pressure issue as the gauge precisely would sit in the lower red area, but after this valve replacement, was now sitting in green.

Im trying to understand if this is an installation issue, if this kind of issue is typical, and if any one else has experienced this low level of reliability with their Bosch Greenstar boiler.

Im told by the company that installed it that we are now outside the warranty period, but im frustrated that the issues persist even after several service calls.

Any advice? Do I call a different company to audit the unit and installation? How do I deal with this beyond constantly feeling like the system is unreliable? Its brand new - replacing it is not really an option, as we spent $16k installing it in the first place - less than 2 years ago!

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