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GG-75H 75,000 64,000 56,000 371.3
GG-100H 100,000 83,000 72,000 481.3
GG-125H 125,000 103,000 90,000 597.3
GG-150H 150,000 125,000 109,000 742.6
GG-175H 175,000 145,000 126,000 840.6
GG-200H 200,000 167,000 145,000 968.0
GG-225H 225,000 186,000 162,000 1078.0
GG-250H 250,000 209,000 182,000 1211.3
MODEL
NUMBER ±
A.G.A.
INPUT
(Btuh)
D.O.E.
CAPACITY
(Btuh)
NET I=B=R
RATING
WATER
(Btuh)*
WATER
(Sq.Ft.)
RATINGS FOR WATER
GG SERIES Hot Water Model
RATINGS - NATURAL AND L.P. PROPANE GAS
GG-275H 275,000 228,000 198,000 1322.0
GG-300 300,000 240,000 ** 209,000 1390.0
GG-325 325,000 260,000 ** 226,000 1510.0
GG-350 350,000 280,000 ** 243,000 1620.0
GG-350H 350,000 291,000 ** 253,000 1684.0
GG-375 375,000 300,000 ** 261,000 1740.0
GG-375H 375,000 304,000 ** 264,000 1760.0
GG-399H 399,000 327,000 ** 284,000 1893.3
MODEL
NUMBER †
A.G.A.
INPUT
(Btuh)
D.O.E.
CAPACITY
(Btuh)
NET I=B=R
RATING
WATER
(Btuh)*
WATER
(Sq.Ft.)
RATINGS FOR WATER
± GG models: Add suffix “S” for standard water boiler, “P” for
packaged water boiler. Add suffix “E” for intermittent pilot igni-
tion system (available only with 24 volt gas valve). Type of
gas: After model number, specify gas by name “Natural” or
“Propane”
* Net ratings are based on a piping and pick-up allowance of
1.33 (steam) and 1.15 (hot water). Slant/Fin should be con-
sulted before selecting a boiler for installation having
unusual piping and pick-up requirements. Ratings must
be reduced by 4% at 2,000 feet elevation and an addition
al 4% for every additional 1,000 feet elevation over 2,000
feet.
EFFICIENCY
GALAXY DOE SEASONAL
EFFICIENCY (AFUE)*
GG-75 HED 84.78%
GG-100 HED 82.78%
GG-125 HED 82.39%
GG-150 HED 82.98%
GG-175 HED 82.45%
GG-200 HED 83.19%
GG-225 HED 82.51%
GG-250 HED 83.40%
GG-275 HED 82.57%
MODEL
equipment
Before purchasing this appliance read important energy costs
and efficiency information available from your contractor.
THE HYDRONICS
INSTITUTE
GXHA-100 100,000 — 81,000 — — 61,000 254 2
1
/
2
GXH-105 105,000 86,000 86,000 495 75,000 65,000 271 2
1
/
2
GXHA-120 120,000 — 97,000 — — 73,000 304 3
GXH-125 126,000 104,000 104,000 600 90,000 78,000 325 3
GXH-150 147,000 120,000 120,000 695 104,000 90,000 375 3
1
/
4
GXHA-160 160,000 — 130,000 — — 98,000 408 3
1
/
2
GXH-170 168,000 137,000 137,000 795 119,000 103,000 429 3
1
/
2
GXH-190 189,000 155,000 155,000 895 135,000 116,000 483 3
3
/
4
GXHA-200 200,000 — 163,000 — — 122,000 508 4
GXH-210 210,000 172,000 172,000 995 150,000 129,000 538 4
GX-225 225,000 184,000 179,000 1065 160,000 134,300 560 4
GXH-230 231,000 189,000 189,000 1095 164,000 142,000 591 4
1
/
4
GX-250 250,000 204,000 198,000 1180 177,400 148,500 620 4
1
/
2
GXH-250 252,000 206,000 206,000 1195 179,000 155,000 646 4
1
/
2
GXH-275 273,000 223,000 223,000 1290 194,000 167,000 696 5
GXH-300 300,000 240,000 ** 240,000 ** 1395 209,000 180,000 750 5
1
/
2
GXH-300H§ 300,000 243,000 ** 243,000 ** 1405 211,000 182,000 758 5
1
/
2
MODEL
NUMBER †
A.G.A.
INPUT
(Btuh)
D.O.E.
CAPACITY
WATER
(Btuh)
D.O.E.
CAPACITY
STEAM
(Btuh)
WATER
(Sq.Ft.)
WATER
(Btuh)
STEAM
(Btuh)
STEAM
(Sq.Ft.)
TANKLESS
HEATER
CAPACITY
(G.P.M.)‡
RATINGS STEAM OR WATER NET I=B=R*
GXH-105 ED 81.00
GXH-125 ED 81.00
GXH-150 ED 81.14
GXH-170 ED 81.14
GXH-190 ED 81.14
GXH-210 ED 81.17
GX-225 ED 81.30
GXH-230 ED 81.21
GX-250 ED 80.70
GXH-250 ED 81.24
GXH-275 ED 81.28
† GXH and GX models: Add suffix “PT” for standard water
boiler with tankless heater, “PZ” for steam boiler, “PZT” for
packaged steam boiler with tankless heater. Add suffix “E”
for intermittent pilot ignition system (available only with 24
volt gas valve).Type of gas: After model number, specify
gas by name “Natural” or “Propane”.
** CSA output rating (Btuh).
§ Ratings for GXH-300H are for natural gas only.
‡ Tankless heater ratings based on intermittent draw.
NOTE: All boilers under 300,000 Btu input are tested and
rated for capacity under the U.S. Dept. of Energy (D.O.E.)
Test Procedure for boilers.
GX and GXH Hot Water Models (tankless heaters) GX, GXH and GXHA Low Pressure Steam Models (optional tankless heater)
* Includes intermittent pilot and
vent damper. Annual Fuel
Utilization Efficiency based on
constant circulation for hot
water models.
equipment listed for ALL MODELS, plus built-in air eliminator; pressure and
temperature gauge; circulator; drain cock; 3-way combination control (hi-limit,
circulator relay and lo-limit with differential); tankless heater.
PACKAGED STEAM BOILER (SUFFIX PZ) includes all equipment listed for ALL
MODELS, plus steam pressure limit control with siphon; pressure gauge; low water
cutoff and water level sight glass (unmounted); drain cock, transformer and junction
box.
PACKAGED STEAM BOILER WITH TANKLESS HEATER (SUFFIX PZT) includes
all equipment listed for ALL MODELS and for model PZ, plus tankless heater instead
of cover plate; low limit control.
OPTIONAL EQUIPMENT Room thermostat. Air package consisting of diaphragm
expansion tank, fill and pressure reducing valve, and automatic air vent. Combustible
floor kit. Intermittent pilot ignition system.
ALL MODELS include pre-assembled heat exchanger; base; flue collector; gas
burners; gas orifices and manifold assembly; combination gas valve including
manual shut-off, pressure regulator, pilot adj., automatic pilot-thermocouple safety;
pressure relief valve (ASME); draft hood (integral draft diverter in GXHA models);
blocked vent safety switch; rollout safety switch; pre-assembled insulated semi-
extended jacket (extended as shown); automatic vent damper (except GG-300
through GG-399 and GXH-300).
BASIC WATER BOILER (SUFFIX S) includes all equipment listed for ALL MODELS,
plus built-in air eliminator; hi limit control; pressure and temperature gauge.
PACKAGED WATER BOILER (SUFFIX P) includes all equipment listed for ALL
MODELS and for model S, plus 2-way combination control (hi limit and circulator
relay), instead of hi limit control; circulator; drain cock.
PACKAGED WATER BOILER WITH TANKLESS HEATER (SUFFIX PT) includes all
GXHA-100 ED 81.00
GXHA-120 ED 81.20
GXHA-160 ED 81.20
GXHA-200 ED 81.30