Before 2014-15, Rony Seikaly had the most rebounds per game for the Heat in a season, with 11.8 per game in 1991-92.

most rpg in a season for a heat before 2014-15
Interpreted as:
most rpg with a minimum of 41 games played per 82 team games by a player in a season for a heat before 2014-15
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1991-92Seikaly1992-93Seikaly1990-91Seikaly1998-99Mourning1994-95Willis2004-05O'Neal1995-96Mourning1989-90Seikaly1993-94Seikaly2002-03Grant1996-97Mourning2003-04Odom2000-01Mason1997-98Mourning1999-00Mourning2005-06O'Neal2004-05Haslem2007-08Haslem1995-96Willis2000-01Grant2008-09Marion1997-98Brown11.811.811.111.010.710.410.410.410.310.29.99.79.69.69.59.29.19.08.98.88.78.6
NAMESEASONTMGPRPGMPGPPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Rony SeikalyRony Seikaly1991-92MIAMIA7911.835.416.41.40.51.52.75.912.048.90.00.00.04.76.473.32,8001,29693410940121216278
Rony SeikalyRony Seikaly1992-93MIAMIA7211.834.117.11.40.51.22.85.812.148.00.00.112.55.57.573.52,4561,2328461003883203260
Rony SeikalyRony Seikaly1990-91MIAMIA6411.133.916.41.50.81.33.26.212.848.10.00.133.34.06.561.92,1711,050709955186205213
Alonzo MourningAlonzo Mourning1998-99MIAMIA4611.038.120.11.60.73.93.07.013.851.10.00.00.06.09.265.21,7539245077434180139161+340
Kevin WillisKevin Willis1994-95MIAMIA6510.735.417.11.30.90.52.47.015.046.90.00.221.43.04.369.12,3011,112696835933155208
Shaquille O'NealShaquille O'Neal2004-05MIAMIA7310.434.122.92.70.52.32.89.015.060.10.00.04.810.546.12,4921,66976020036171203262+470
Alonzo MourningAlonzo Mourning1995-96MIAMIA7010.438.223.22.31.02.73.78.015.452.30.10.430.07.010.268.52,6711,62372715970189262245
Rony SeikalyRony Seikaly1989-90MIAMIA7410.432.616.61.11.11.73.26.613.150.20.00.00.03.55.859.42,4091,2287667878124236258
Rony SeikalyRony Seikaly1993-94MIAMIA7210.333.515.11.90.81.42.75.411.248.80.00.00.04.25.972.02,4101,08874013659100195279
Brian GrantBrian Grant2002-03MIAMIA8210.232.210.31.30.80.61.64.28.250.90.00.01.92.577.12,6418468371046347129300-304
Alonzo MourningAlonzo Mourning1996-97MIAMIA669.935.219.81.60.82.93.47.213.453.40.00.111.15.58.664.22,3201,31065610456189226272+465
Lamar OdomLamar Odom2003-04MIAMIA809.737.517.14.11.10.93.06.114.143.00.82.629.84.35.774.23,0031,3717763278571236273+59
Anthony MasonAnthony Mason2000-01MIAMIA809.640.716.13.11.00.32.25.811.948.20.00.04.65.978.13,2541,2907702488025179231+110
Alonzo MourningAlonzo Mourning1997-98MIAMIA589.633.419.20.90.72.23.16.912.655.10.00.05.38.066.51,9391,1155585240130179208+429
Alonzo MourningAlonzo Mourning1999-00MIAMIA799.534.821.71.60.53.72.78.315.055.10.00.10.05.27.471.12,7481,71875312340294217308+270
Shaquille O'NealShaquille O'Neal2005-06MIAMIA599.230.620.01.90.41.82.88.113.660.00.00.03.78.046.91,8061,18154111323104168230+269
Udonis HaslemUdonis Haslem2004-05MIAMIA809.133.410.91.40.80.51.44.38.054.00.00.10.02.22.879.12,6758707261086341113260+414
Udonis HaslemUdonis Haslem2007-08MIAMIA499.036.812.01.40.80.41.44.810.346.70.00.02.32.981.01,80558944368391867145-330
Kevin WillisKevin Willis1995-96MIAMIA478.928.910.20.70.40.52.14.18.847.30.00.10.01.92.771.21,35747942034192599158
Brian GrantBrian Grant2000-01MIAMIA828.833.815.21.20.70.92.15.912.347.90.00.00.03.44.379.72,7711,2507181016071170293+145
Shawn MarionShawn Marion2008-09MIAMIA428.736.112.01.81.41.11.35.110.648.20.21.020.01.62.078.81,5165053657757455692+17
P.J. BrownP.J. Brown1997-98MIAMIA748.631.99.61.40.91.31.33.88.047.10.00.02.02.776.62,362707635103669897264+288
Grant LongGrant Long1991-92MIAMIA828.437.414.82.71.70.52.35.410.949.40.10.327.34.04.980.73,0631,21269122513940185248
Alonzo MourningAlonzo Mourning2001-02MIAMIA758.432.715.71.20.42.52.46.011.551.60.00.033.33.85.765.72,4551,1786328727186182258+51
P.J. BrownP.J. Brown1996-97MIAMIA808.432.49.51.21.11.21.43.88.245.70.00.00.02.02.873.22,592761670928598113283+346
StatMuse has season-level data for rebounds per game going back to the 1950-51 season.