Buderus GA124 Replacement-PGP

Paul Pollets

Just finished this replacement using the Buderus GA124 condensing boiler and ST200 Indirect DHWTank. The original Heatmaker failed due to severe O2 corrosion. The GA124 is a neat boiler! It's very quiet and easy to vent. We used the ProTek SS vent pipe, which is hung off of Unistrut with galv. loop hangers, pitched to the boiler. The 2107 Logamatic control is running the system on outdoor reset. A marine-grade FPHX separates the non-barrier side of the system (early SolarRoll PB)from the boiler. Tried the new Wirsbo 3way mixing valve which is made by Belimo. The Grundfos 25-64 SS pump makes more noise than the boiler....The 3 existing zones were refitted with Oventrop zone valves and actuator heads, wired to a Wirsbo 3-zone control module. Check out the pic of the original circ pump, which was cast iron, not stainless. Too bad the 2" vent stack for the floor drain was right in the middle of the near-boiler piping....Paint it black??
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Mike Kraft_2

Paul

Alot of things going on there!I am a lover of the GA series.I installed the GA244/37 this year.(first one sold in NA).It's running two fan coils and an ST200 also.The electric anode is a lovely feature.I have been studying your lay of the land.Looks great.I am having some difficulties(it's me not you:) ) and would love to ask you some questions.Hope your in the office!

cheese

Warmfoot

Oventrop Valves

Hey Paul,

Who are you getting your Oventrop Valves from in Seattle. I am having a hard time finding them in stock anywhere!!

Ernie Bogue
Master Hydronics LLC

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Paul Pollets

Blueline

Hi Ernie, I get them from Blueline Supply in Jackson Hole, WY. Chris Rorke's the man.

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Paul Pollets

Contact...

email is the best way to get me.


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Mike Kraft_2

Oventrop

Pieter de Haan @

heatlines@comcast.net

cheese

hr

Nice work

as usual. Your work looks look good in blue, too!

The black Grundfos with the check mark, is this OEM or a MixiMiser? Never seen black before in the check pumps.

Does the boiler require ss vent pipe or can PVC be used if it's a condensor?

hot rod

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Mike Kraft_2

Paul

Looked at the picture for awhile.I am not familiar with the mixing valve and controls.I see the PDBV is installed.Is this system under constant circulation or is this to compensate for zone heads opening and closing?The HX is installed on top left?yes?You said that the boiler is a condensing boiler.....untrue.The GA is not a condenser.The Trianco......I see another tank.was the heatmaker tank still active?Or is the other for additional DHW?

cheese.......PS Pieter is a great source for Oventrop

Paul Pollets

Thanks

Hot Rod, the pump is OEM and comes with the boiler. The boiler requires SS vent only using (4 selected mfg's. HeatFab is usable in horiz or vertical venting. You can download the installation manual and venting requirements on the Buderus website. The fresh air intake can be 3" 28g galv. pipe. I was pleased with the instruction manual...Gone is the "Ginglish", or poor German to English translations, that plagued earlier manuals. See:http://www.buderus.net/literature/GA124-IOM-01.pdf

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Ted_9

Buderus

The GA124: Sealed Combustion.
Venting: Approved for use with Heat Fab, Z-Flex, Flex-L and Pro-Tech 3" AL 29-4C stainless steel material.

Thats right from the book.

Paul Pollets

More...

The system is on constant circ, with zone valves, hence the PBD. The ST200 is the only DHW Tank. The original was toast. The GA Boiler requires a condensate drain tee as the first fitting in the vent. The boiler can handle 104 deg.F min temps, which is well below the condensing point of nat. gas.

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Mark Hunt

I was not aware


that the GA was a condensing boiler.

I just thought it was sealed combustion.

Nice looking work Paul!

Mark H

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tim smith_2

Buderus GA 124 boiler

Paul, good looking job, I too was not aware of the boiler being a condensing boiler?? I have installed a few of these and they are whisper quiet. The quietest boiler I have found in a Mid 80% boiler I have found. I have not used one on radiant floor heat yet. But on the cast jobs I used them on they are great.

Mike Kraft_2

This Boiler Is Not A Condensing Boiler!

Yes the 2107 control STOPS circulation @ 104°.The dew point of NAT Gas is 130°.The 2107 allows the boiler to maintain a standby temp.It no longer is a cold start boiler.So my point is that the likelyhood of condensing flue gas through the HX is pretty slim.I don't think that Buderus just came down with this mornings rain:)

As far as a condensate tee as the first fitting on the flue take-off...........Well thats pretty standard spec on draft induced gas fired appliances.Reason being that the manufacure wants to protect the inducer from condensation.Is the condensation coming from flue gas.......yep Is it a result of low temperature flue gas leaving the HX.Nope..........It's a result of warm flue gas (hot) crashing into a cold enviroment.IE cold crawls,unconditioned spaces etc.In a concentric termination application such as the GA boiler the hot and cold gas worlds definitely collide!!Giving condensation water more reason to spill.

Does this make the Buderus GA a condensing boiler......nope!But there is one coming:)

cheese

Joe@buderus

GA124/Logamatic Control

The GA Series Boiler is sealed combustion, not condensing.

The R2107 and R2109 have a feature to help prevent condensation in the boiler. If the burner circuit in the Logamatic is energized and the boiler temperature is below or can't maintain 104 degree's the circuit for the heat pumps or DHW pump is de-energized. The R2107 Control will not energize the DHW circulator until the boiler temperature is above the tank temperature. On the R2109 a "dip switch" can be selected for this feature. The R2107 does maintain temperature usually only during the coldest temperatures. In mild temperatures, the boiler temperature can drop down to 70 degrees if needed.