Buderus Logano G115WS boiler specs and price: 85k-136k BTU oil-fired model

User question

Buderus G115 Logano boiler specifications and price

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Direct answer to the question

For the Buderus Logano G115 / G115WS in the U.S. market, the current commonly referenced model is the Buderus Logano G115WS, a floor-mounted, cast-iron, oil-fired, hot-water hydronic boiler. It is available mainly in 3-, 4-, and 5-section sizes, with chimney-vent gross outputs of approximately 85,000 / 109,000 / 136,000 BTU/h and about 87% AFUE. Bosch/Buderus documentation describes it as a cast-iron residential oil boiler with improved efficiency around 87% AFUE. (bosch-homecomfort.com)

Typical U.S. online equipment pricing currently seen:

Model	Gross output	Net IBR output	Typical online equipment price
G115WS/3	85,000 BTU/h	74,000 BTU/h	About $2,326 boiler only, burner sold separately
G115WS/4	109,000 BTU/h	95,000 BTU/h	About $2,663 boiler only, burner sold separately
G115WS/5	136,000 BTU/h	119,000 BTU/h	About $2,912 boiler only, burner sold separately

Those boiler-only prices are from an online HVAC retailer listing the G115WS/3, /4, and /5 as “burner sold separately.” (ecomfort.com) A separate distributor listing shows a G115WS/4 with Riello chimney-vent burner at $4,194.30, while noting that the Logamatic control and aquastat are not included. (supplyhouse.com)

Installed cost is normally much higher than equipment-only cost because it can include burner, aquastat/control, circulators, expansion tank, piping, venting/chimney work, oil line work, labor, permits, and commissioning.

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Detailed problem analysis

1. Product identification

The Buderus Logano G115WS is not a modern wall-hung condensing boiler. It is a non-condensing, cast-iron, 3-pass, oil-fired hot-water boiler intended for hydronic space heating. It can also be paired with an indirect domestic hot-water tank. Bosch/Buderus documentation identifies it as a cast iron residential oil boiler and lists both chimney vent and direct vent configurations. (bosch-homecomfort.com)

A common point of confusion: older discussions may refer simply to G115, while the current North American version is usually labeled G115WS. Also, while conversion gas burners may exist in some field installations, the standard North American G115WS specification is for No. 2 fuel oil, not natural gas. The installation manual states that the boiler may be operated with #2 Fuel Oil ASTM D396 Type 2 when an appropriate burner is selected. (bosch-homecomfort.com)

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2. Main specifications

Specification	G115WS/3	G115WS/4	G115WS/5
Boiler sections	3	4	5
Chimney-vent gross output	85,000 BTU/h	109,000 BTU/h	136,000 BTU/h
Chimney-vent Net IBR	74,000 BTU/h	95,000 BTU/h	119,000 BTU/h
Direct-vent gross output	74,000 BTU/h	98,000 BTU/h	120,000 BTU/h
Direct-vent Net IBR	64,000 BTU/h	85,000 BTU/h	104,000 BTU/h
AFUE	87%	87%	87%
Chimney-vent firing rate	0.70 GPH	0.90 GPH	1.10 GPH
Direct-vent firing rate	0.60 GPH	0.80 GPH	1.00 GPH
Water content	8.7 gal	10.8 gal	12.9 gal
Dry/net weight	330 lb	403 lb	476 lb

These values are taken from Buderus/Bosch technical literature for the G115WS series. (bosch-homecomfort.com)

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3. Connections, dimensions, and operating limits

Parameter	Value
Vent connection	5 in
Supply connection	1¼ in
Return connection	1 in
Overall length	23⅝ in / 28⅝ in / 33⅜ in for /3, /4, /5
Width	About 23½ in
Height	About 34½ in
Allowable operating pressure	58 psi maximum
Normal system pressure	Typically 15–30 psi with supplied safety valve
Maximum safety-limit temperature	Up to 230 °F depending on control configuration
Electrical supply	120 VAC, 60 Hz
Recommended breaker	10 A
Enclosure rating	IP40

The Bosch installation manual lists 58 psi allowable operating pressure, 120 V AC / 60 Hz power, a 10 A circuit breaker, and typical closed-system operating pressure of 15–30 psi. (bosch-homecomfort.com)

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Current information and trends

The G115WS is a durable conventional oil boiler, but it is not a condensing appliance. Its approximate 87% AFUE is good for a cast-iron oil boiler, but below the efficiency of many modern gas-fired condensing boilers. Bosch/Buderus emphasizes the boiler’s 3-pass heat exchanger, GL-180M flexible cast iron, and full 3-inch insulation jacket as design features to reduce losses and improve longevity. (bosch-homecomfort.com)

Current market trend in hydronics is toward:

• Higher-efficiency condensing boilers where gas or propane is available.
• Outdoor-reset control for lower seasonal fuel consumption.
• Indirect domestic hot-water tanks instead of tankless coils.
• More attention to proper sizing by heat-loss calculation, rather than replacing the old boiler with the same BTU size.

For an oil-heated home where the chimney and oil infrastructure already exist, the G115WS can still be a strong replacement choice. For a new installation, it is worth comparing it against high-efficiency condensing gas/propane boilers, cold-climate heat pumps, or hybrid systems depending on fuel cost and local code requirements.

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Supporting explanations and details

Boiler-only vs boiler-with-burner price

There are two different price categories:

1. Boiler block only / boiler without burner
   Example: online listings show:

   • G115WS/3: about $2,326
   • G115WS/4: about $2,663
   • G115WS/5: about $2,912
     These listings specify that the burner is sold separately. (ecomfort.com)

2. Boiler with burner package
   Example: a G115WS/4 package with Riello burner is listed at $4,194.30, but the listing also notes that the R2107 Logamatic control is not included and that an aquastat is not included. (supplyhouse.com)

In practical contractor quotations, the second category is closer to what you need, because a boiler block alone is not a complete operational heating system.

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Controls and electrical considerations

From an engineering/control standpoint, the G115WS is a relatively simple hydronic appliance. Depending on configuration, it may use:

• A conventional aquastat such as a Honeywell-style high-limit control.
• Beckett AquaSmart or Hydrolevel HydroStat control.
• Buderus Logamatic 2107 outdoor-reset control.
• Burner primary control for Riello, Beckett, or Carlin oil burner.
• 120 VAC burner and circulator control circuits.
• Low-voltage thermostat or zone-control interfaces.

The manual specifically gives 120 VAC nominal supply, 60 Hz, and grounding requirements. (bosch-homecomfort.com)

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Practical guidelines

If you are buying or replacing a Buderus G115/G115WS:

1. Confirm the exact model

   • G115WS/3, /4, or /5.
   • Chimney vent or direct vent.
   • Burner brand: Riello, Beckett, or Carlin.
   • Control package: aquastat, HydroStat, AquaSmart, or Logamatic.

2. Do not size by old boiler nameplate alone

   • Have a contractor perform a Manual J / heat-loss calculation.
   • Oversizing an oil boiler causes short cycling, lower seasonal efficiency, and more burner wear.

3. Ask whether the quoted price includes

   • Burner.
   • Aquastat or Logamatic control.
   • Circulator pumps.
   • Expansion tank.
   • Relief valve.
   • Low-water cutoff if required by local code.
   • Oil filter, oil line, fire valve.
   • Chimney liner or direct-vent kit.
   • Combustion analysis and commissioning.

4. Check venting

   • Chimney condition matters. A high-efficiency 3-pass oil boiler may have lower stack temperature than an older boiler, so chimney condensation risk should be evaluated.

5. Require combustion setup

   • The installer should perform smoke test, draft measurement, CO₂/O₂ measurement, stack temperature, and efficiency check with calibrated instruments.

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Possible disclaimers or additional notes

• Prices vary by region, distributor, installer markup, shipping, and availability.
• Online retail pricing is not the same as contractor-installed pricing.
• A G115WS is an oil-fired hydronic boiler, not a gas condensing boiler.
• If your existing unit is very old and labeled only “G115,” parts and specifications may differ slightly from the current G115WS literature.
• Installation and commissioning should be performed by a licensed hydronic/oil-burner technician; distributor documentation also states that heating equipment must be installed, commissioned, and serviced by a licensed qualified professional. (supplyhouse.com)

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Brief summary

The Buderus Logano G115WS is a high-quality cast-iron, 3-pass, oil-fired hot-water boiler with about 87% AFUE. The main U.S. sizes are:

• G115WS/3: 85k BTU/h gross, 74k Net IBR.
• G115WS/4: 109k BTU/h gross, 95k Net IBR.
• G115WS/5: 136k BTU/h gross, 119k Net IBR.

Current online equipment-only prices are roughly $2,300–$2,900 without burner, while a G115WS/4 with Riello burner is listed around $4,200. Installed cost must be quoted locally because labor, venting, controls, piping, and code-required accessories can dominate the final price.

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