Grundfos Pumps to MTH Pumps Replacement Cross-reference Chart
MTH vs Grundfos Cross-Reference
Cold Water Selection Table
CAPACITY GPM MFR MODEL & LIST PRICE PUMP PRESSURE
15 PSI 50 PSI 75 PSI 100 PSI 125 PSI 150 PSI 200 PSI 250 PSI 300 PSI
2 MTH Model M51C-1/3 M51C-1/3 M51D-1/2 M51C-1/2 M51C-1/2 M51D-3/4 M51D-1 M52B-1 M52D-2
Grundfos "C"
2-20/1-1/4
2-30-3/4
2-40-1
2-50-1.5
2-70-2
2-80-2
2-100-3
2-150-5
2-150-5
5 MTH Model M51C-1/3 M51C-1/3 M51D-1/2 M51D-3/4 M51D-3/4 M51D-3/4 M51E-2 M52D-1.5 M52D-2
Grundfos "C"
2-20-1/2
2-30-3/4
2-40-1
2-60-1.5
2-70-2
2-80-2
2-120-3
2-150-5
2-180-5
10 MTH Model M51P-1/2* M51E-3/4 M51J-1.5 M51G-1.5 M51G-2 M51G-2 M51J-3 M52J-5 M52J-5
Grundfos "C"
2-20-1/2
2-30-3/4
2-50-1.5
2-70-2
2-80-2
2-100-3
2-120-3
2-150-5
2-180-5
15 MTH Model M51R-3/4* M51J-1.5 M51J-1.5 M51L-3 M51L-3 M51L-5 M51M-5 M52L-7.5 M52L-7.5
Grundfos "C"
4-20-3/4
4-30-1.5
4-40-1.5
4-60-3
4-80/7-3
4-80-3
4-120-5
4-160/14-5
8-140-15
20 MTH Model M51L-1.5 M51L-2 M51M-3 M51M-3 M51M-3 M51P-5 M51R-7.5 M52P-7.5 M52P-10
Grundfos "C"
4-20-3/4
4-30-1.5
4-50-2
4-60-3
4-80/7-3
4-100-5
4-120-5
4-160/14-5
8-160-15
25 MTH Model M51M-1.5 M51P-3 M51P-3 M51P-5 M51R-5 M51R-7.5 M51R-7.5 M52R-10 M52R-10
Grundfos "C"
4-20-3/4
4-40-1.5
4-50-2
4-80/7-3
4-80-3
4-100-5
4-160/14-5
8-120-10
8-160-15
30 MTH Model M51P-2 M51R-3 M51R-5 M51R-5 M51R-5 M51R-7.5 M52R-7.5 M52R-10 M53R-15
Grundfos "C"
8-20-1.5
8-30-3
8-40-3
4-80/7-3
8-60-5
8-80-7.5
8-100-7.5
8-120-10
8-140-15
35 MTH Model M51R-3 M51R-3 M51R-5 M51R-5 M51R-7.5 M51R-7.5 M53R-10 M53R-10 M54R-15
Grundfos "C"
8-20-1.5
8-30-3
8-40-3
8-50-5
8-60-5
8-80-7.5
8-100-7.5
8-120-10
8-160-15
All Pumps are of standard fitted construction with mechanical seals.
Series "M50" and "L50" are Vertical Base mounted direct coupled to motor.
Motors up to 3 HP are open dripproof, 5 HP and larger are totally enclosed.
1/3 HP motor is 1/60/115/208-230 Volt, 1/2 HP and larger are 3/60/208-230/460 Volt.
Selections based on Cold Water.
*Indicates 1750 RPM. All others are 3450 RPM.

MTH Vs Grundfos Cross-Reference
Boiler Feed Selection Table
BOILER HP GPM EVAP. MFR MODEL & LIST PRICE BOILER PRESSURE
15 PSI 50 PSI 75 PSI 100 PSI 125 PSI 150 PSI 200 PSI 250 PSI 300 PSI
20 1.4 MTH Model M51C-1/3* M51C-1/3* M51D-1/2* M51C-1/2* M51D-3/4* M51D-3/4* M51D-1* M52D-1.5* M52D-2*
Grundfos "C"
2-20/1-1/4
2-30-3/4
2-50-1.5
2-60-1.5
2-80-2
2-100-3
2-120-3
2-150-5
2-180-5
30 2.1 MTH Model M51C-1/3 M51C-1/3* M51D-1/2* M51D-3/4* M51D-3/4* M51D-3/4* M51D-1* M52D-1.5* M52D-2*
Grundfos "C"
2-20/1-1/4
2-30-3/4
2-50-1.5
2-60-1.5
2-80-2
2-100-3
2-120-3
2-150-5
2-180-5
40 2.75 MTH Model M51D-1/3 M51D-1/2* M51D-1/2* M51E-1* M51E-1.5* M51E-1.5* M51E-2* M52E-3* M52E-3*
Grundfos "C"
2-20-1/2
2-30-3/4
2-50-1.5
2-60-1.5
2-80-2
2-100-3
2-120-3
2-150-5
2-180-5
50 3.5 MTH Model M51E-1/2 M51E-3/4* M51E-1* M51E-1* M51E-1.5* M51E-1.5* M51G-3* M52E-3* M52G-5*
Grundfos "C"
2-20-1/2
2-30-3/4
2-50-1.5
2-60-1.5
2-80-2
2-100-3
2-120-3
2-150-5
2-180-5
60 4.16 MTH Model M51E-1/2 M51E-3/4* M51E-1* M51E-1* M51E-1.5* M51G-2* M51J-3* M52E-3* M52J-5*
Grundfos "C"
2-20-1/2
2-40-1
2-50-1.5
2-70-2
2-80-2
2-100-3
4-120-5
2-180-5
8-160-15
80 5.5 MTH Model M51P-1/2* M51J-1.5* M51J-1.5* M51J-2* M51J-2* M51J-3* M51M-5* M52J-5* M52J-5*
Grundfos "C"
2-20-1/2
2-40-1
2-50-1.5
2-70-2
4-80-3
2-100-3
4-120-5
2-180-5
8-160-15
100 6.9 MTH Model M51R-3/4* M51J-1.5* M51J-1.5* M51L-3* M51L-3* M51M-5* M51M-5* M52M-7.5* M52L-7.5*
Grundfos "C"
4-20-3/4
4-40-1.5
4-50-2
4-80/7-3
4-80-3
4-100-5
4-120-5
8-140/13-10
8-160-15
125 8.6 MTH Model M51R-3/4* M51L-2* M51M-3* M51M-3* M51M-3* M51M-5* M51R-7.5* M52M-7.5* M52M-7.5*
Grundfos "C"
4-20-3/4
4-40-1.5
4-50-2
4-80/7-3
4-80-3
4-100-5
4-160/14-5
8-140/13-10
8-160-15
150 10.4 MTH Model 181K-3/4 M51P-3* M51P-3* M51P-5* M51P-5* M51P-5* M51R-7.5* M52P-7.5* M52P-10*
Grundfos "C"
4-20-3/4
4-40-1.5
4-60-3
4-80/7-3
4-100-5
4-100-5
4-160/14-5
8-140/13-10
8-160-15
200 13.8 MTH Model 181K-3/4 M51R-3* M51R-5* M51R-5* M51R-5* M51R-7.5* M51R-7.5* M52R-10* M52R-10*
Grundfos "C"
4-20-3/4
4-40-1.5
4-60-3
4-80-3
4-100-5
4-120-5
8-100-7.5
8-140/13-10
8-160-15
250 17.3 MTH Model 181M-1.5 L51R-5* L51R-5* L52R-7.5* L52R-7.5* L52R-7.5* L53R-10* L53R-10* L53R-15*
Grundfos "C"
8-20-1.5
8-30-3.
8-50-5
8-60-5
8-80-7.5
8-80-7.5
8-120-10
8-140/13-10
8-160-15
300 21 MTH Model 181P-1.5 151L-5 151L-5 151L-7.5 152K-7.5 152L-10 153L-15 154L-15 154L-20
Grundfos "C"
8-20-1.5
8-40-3
8-50-5
8-60-5
8-80-7.5
8-100-7.5
8-120-10
8-140-15
8-160-15
350 24.4 MTH Model 181S-1.5 151L-5 151L-5 152L-7.5 152L-7.5 153L-10 153L-15 163G-20 163G-25
Grundfos "C"
8-20-1.5
8-40-3
8-50-5
8-60-5
8-80-7.5
8-100-7.5
8-120-10
8-140-15
8-160-15
400 27.6 MTH Model 151L-3 161G-5 161G-7.5 152L-7.5 162G-10 153L-10 163G-15 163G-20 164G-25
Grundfos "C"
8-20-1.5
8-40-3
8-50-5
16-40-7.5
8-80-7.5
8-100-7.5
8-120-10
8-140-15
8-160-15
500 34.5 MTH Model 151L-3 161G-5 162G-7.5 162G-10 162G-10 163G-15 164G-20 164G-20 274K-40
Grundfos "C"
8-20-2
8-40-5
8-60-5
16-50-10
16-60-15
16-70-15
16-80-15
16-100-20
16-120-25
600 41.5 MTH Model 261G-5 271H-7.5 271J-10 272J-15 272J-15 272J-20 273K-25 274J-30 274K-40
Grundfos "C"
32-1-1,-3
32-2-1,-7.5
32-3-2,-10
16-50-10
16-60-15
16-70-15
32-6-2,-25
16-100-20
16-120-25
700 48.3 MTH Model 271H-5 271J-7.5 272H-10 272J-15 272J-15 273J-20 273K-25 274K-40  
Grundfos "C"
32-1-1,-3
32-2-1,-7.5
32-3-2,-10
16-50-10
16-60-15
16-70-15
32-6-2,-25
16-120-25
800 55.2 MTH Model 271J-5 271K-10 272J-10 272K-15 272K-15 273K-20 274K-30  
Grundfos "C"
32-1-1,-3
32-2-1,-7.5
32-3-2,-10
16-50-10
16-60-15
16-70-15
32-6-25
All Pumps are of standard bronze fitted construction with mechanical seals.
Series "M50" and "L50" are Vertical Base mounted direct coupled to motor.
Motors up to 3 HP are open dripproof, 5 HP and larger are totally enclosed.
Series 140,180,150,160,170,260 & 270 are horizontal base mounted with flexible coupling, guard and open dripproof motor.
1/3 HP motor is 115/208-230 Volt, 1/2 HP and larger are 3/60/208-230/460 Volt. *3450 RPM all others 1750 RPM.
Selections based on 190°F water. Pump capacity based on two times evaporation rate.

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