Baxi Luna Underperforming?

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Old 12-10-08, 09:38 AM
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Baxi Luna Underperforming?

I recently had a Baxi Luna wallhung unit installed with 30 gal external holding tank. My living space is 950 sq. ft. The floor radiators are connected by half-inch diameter copper. I've been monitoring the output and feel that, given the new technology, it is under performing. When I track the number of degrees the ambient temperature rises after manually making a request at the thermostat, the range is between .8 and 1.4 degrees(F)/hour over several hours. Would this be considered normal, or should one expect greater output?

By the way, my previous wallhung unit was an old, castiron British Netaheat boiler which, by comparison, heated my space in a reasonable time.
 
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Old 12-10-08, 09:08 PM
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Is this a condensing model? If so recoveries should be gradual and limited. If not, the water being circulated will have to get much hotter and the higher return temperatures will reduce the efficiency of the boiler significantly one it get up into the 130* range.

How much do you need to recover on a regular basis and what is the rationale for setting back so far? How long does it take for the temperature in your space to drop.
 
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Old 12-14-08, 11:34 AM
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It is a standard modulating boiler. As the homeowner, I've been surprised that the output isn't greater. The new boiler is rated higher than my previous cast-iron Netaheat, but the output (as measured by rise in ambient air temperature) is much weaker. Touching the floor radiators, they are barely warm most of the time.
 
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Old 12-14-08, 12:23 PM
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I'm sure you could configure it to only fire at full output and also allow it to go up to the maximum output temperature. That wouldn't be my preference. I like to keep my flue temps as low as possible so that I use as little energy as possible.

Modulating boilers are designed to gently match the heatload.

How much do you need to recover on a regular basis and what is the rationale for setting back so far? How long does it take for the temperature in your space to drop.
 
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