New Boiler choice

Ron Schroeder

Depending on how oversized you are, you may be able to underfire the boiler instead of replacing it.

JackFre

New Boiler Choice

I'm fixin' to convert my 45yr old homes baseboard system (on the first floor) to radiant. So, I'm going to sell my 6 yr old oversized (140K) Buderus G224, Bud. 40 gal indirect and Ecomatic. Question is, what low temp modulating/condensing gas appliance to replace it with. I'll continue to use my Rinnai Continuum for DHW. What do you like, why and what to use for controls. Have a Happy T-day and thanks for your help! BTW, I'll probably go Hydro-Air on the second floor

Jim_65

Boiler Replacement?

Why would you want to replace the existing 6 year old Buderus system including a quality control such as the Ecomatic? How do you know the boiler is oversized? Your contractor could still keep that system intact and reconfigure the piping to accomodate a hybrid system.

If you go Hydro-Air on the second floor that unit is designed for high temp applications unless the designer designs based off of the radiant floor temperature requirements.

If you actually want to replace the heat source check out the Buderus GB142 or a Vitodens. Both of those options are wall hung condensing modulating boiler.

Good luck!

kevin coppinger_4

nice thought....

but, its gas and Buderus hates underfiring any of their boilers, oil or gas...kpc

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JackFre

If I am to do this conversion

by replacing the boiler with a wall hung I will gain: a matched system (boiler to dist system); space, as I will relocate the mechanicals (Rinnai Continuum is going to the second floor between the bathrooms so I will reduce HW piping by over 70%); an open flue stack for whatever I dream up for future use; room-and a complete mod of the basement space for my shop. I'm kinda two blocked for what I want to do now and last but by no means least, comfort and value. I also have all you guys to blame for this. If I wasn't hanging out here I wouldn't have come up with this.

Wayco Wayne_2

Sounds like

you know what you are doing. What is your heat loss? I recently put in a Prestige from Triangle Tube. Liked it a lot. I've seen some wonderful pics on The Wall of the new Buderus GB.

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Ron Schroeder

Hi Kevin,

While the Buderus lierature states to not under fire thier boilers, in reality, that is not true. When I talked to the Buderus engineers, they said you can underfire if you keep the stack temperature up above the condensing point. You can do that with the proper use of the baffles and proper controls settings. I have successfully fired a G115-21 (normally .6gph) at under .25gph for extended periods of time.

Ron

Bill_44

Hi-velocity fan coil

Go to www.hi-velocity.com for info RE: your 2nd floor options. Hi-velocity air delivery is a perfect compliment to radiant because it can heat, cool & make-up air efficiently and because it moves more air, it can also purify more air (with the proper purification equipment). This is important for family members who are affected by allergies.

kevin coppinger_4

I suppose...

that could be said about a lot of things..."If you know the Rules you can break them"....kpc

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S Ebels

Different animal

Underfiring an oil burner can be done if, like you pointed out, you know what you are doing. You can vary the air, fuel pressure, nozzle size and other minor adjustments along with the baffles in the boiler. (if so equipped)

Underfiring an atmospheric gas such as Buderus' 124, 224, and 334 series is a whole 'nuther can of worms. You can under or over fire very little because the burner tubes are designed to provide correct air/fuel mixing within a fairly narrow range of parameters. Most boilers of this type come with fixed air shutters and all you have to play with is gas pressure. Very small decreases or increases will begin to wreak havoc with your flue gases. CO will go south in a hurry with either too much or not enough air being mixed in the burner tube.

If however you have a power gas burner, you can do about the same as you can with oil. Just keep that stack temp above condensing temps.

Trouble is, when was the last time you saw a CI, residential gas boiler with a power burner?