Nexus Bitherm S

The Nexus Bitherm S is a wall mounted interface unit, with all top connections, suitable for studio flats and up to 2/3 bedroom apartments where instantaneous DHW generation and indirect apartment heating are required.

Specification:

  • DHW output up to 60kW (model dependent)
  • Heating output up to 10kW (model dependent)
Approved-Product-colour_sma
  • Wall mounted design
  • Top connections
  • Hydraulic separation between primary and apartment heating circuit
  • Instantaneous DHW generation and secondary heating
  • DHW priority over secondary heating
  • Insulated copper brazed AISI 316 stainless steel plate heat exchangers from SWEP
  • Insulated mains cold water (MCW) pipework
  • Unique ModFlow modulating primary control valves (PICV functionality)
  • Microprocessor controls
  • Electronic temperature control of both DHW and secondary heating
  • Weather compensation facility on secondary heating
  • Switchable keep warm function on DHW plate heat exchanger
  • Insulated painted steel case (RAL 9010) with removable front cover
  • High efficiency ErP compliant modulating secondary heating high torque pump from Wilo
  • 4bar rated pressure relief valve on secondary heating circuit
  • Pressure gauge on secondary heating circuit
  • 8.5 litre expansion vessel on secondary heating circuit
  • Primary circuit strainer
  • Interface with external programmer for time/temp control (volt free contact)
  • Prepaid billing integration
Heating Performance Data up to 5kW
Primary flow temp °CHeating output kWHeating temps °CHeating flow rates l/minResidual pump head Δp-c kPaResidual pump head Δp-v kPaPrimary pressure drop kPaPrimary return temp °C
702.545/353.58855350.17335.1
702.550/403.58855350.23740.1
702.560/401.79455310.25841.4
70545/357.17655370.70435.4
70550/407.17655370.97740.6
70560/403.58855351.22443.7
752.545/353.58855350.13235
752.550/403.58855350.17340.1
752.560/401.79455310.17940.6
75545/357.17655370.53335.2
75550/407.17655370.70340.4
75560/403.58855350.78842.3
802.545/353.58855350.10435
802.550/403.58855350.13240
802.560/401.79455310.13440.3
80545/357.17655370.41935.1
80550/407.17655370.53340.2
80560/403.58855350.56641.4
Heating Performance Data up to 10kW
Primary flow temp °CHeating output kWHeating temps °CHeating flow rates l/minResidual pump head Δp-c kPaResidual pump head Δp-v kPaPrimary pressure drop kPaPrimary return temp °C
707.545/3510.7654421.42135.1
707.550/4010.7654421.92140.3
707.560/405.3855372.42342.2
701045/3514.3548442.56735.3
701050/4014.3548443.5640.5
701060/407.17655384.55543.3
757.545/3510.7654421.07935.1
757.550/4010.7654421.41940.1
757.560/405.3855371.56941.2
751045/3514.3548441.93635.2
751050/4014.3548442.55840.3
751060/407.17655382.9241.9
807.545/3510.7654420.84835
807.550/4010.7654421.07840.1
807.560/405.3855371.13640.6
801045/3514.3548441.51835.1
801050/4014.3548441.93340.2
801060/407.17655382.09141.1
DHW Performance Data up to 40kW
Primary flow temp °CDHW output kWDHW temps °CDHW flow rate l/minDHW pressure drop kPaPrimary flow rate l/minPrimary pressure drop kPaPrimary return temp °C
703010/4512.310.388.1548.2817.19
703010/5010.88.028.6349.2920.11
703010/559.576.339.3910.9824.13
704010/4516.3815.0911.3115.9319.22
704010/5014.411.6312.10818.2622.58
704010/5512.89.1313.3822.327.09
753010/4512.310.387.276.5815.79
753010/5010.88.027.5667.1318.09
753010/559.576.337.9987.9721.16
754010/4516.3815.091012.4617.61
754010/5014.411.6310.4913.7120.3
754010/5512.89.1311.2115.6523.81
803010/4512.310.386.5945.4214.7
803010/5010.88.026.7865.7416.55
803010/559.576.337.056.1918.96
804010/4516.3815.099.01810.1316.32
804010/5014.411.639.33610.8618.53
804010/5512.89.139.78611.9321.35
DHW Performance Data up to 60kW
Primary flow temp °CDHW output kWDHW temps °CDHW flow rate l/minDHW pressure drop kPaPrimary flow rate l/minPrimary pressure drop kPaPrimary return temp °C
705010/4520.519.1613.90221.7118.36
705010/5017.9414.7614.80824.6421.53
705010/5515.9511.6716.2429.6325.82
706010/4524.625.217.14233.0219.75
706010/5021.619.318.40838.0723.21
706010/5519.215.2620.4246.8527.83
755010/4520.519.1612.34217.1116.83
755010/5017.9414.7612.918.719.35
755010/5515.9511.6713.71621.1422.67
756010/4524.625.215.13225.7318.09
756010/5021.619.315.91228.4520.87
756010/5519.215.2617.04632.6524.49
805010/4520.519.1611.14813.9615.62
805010/5017.9414.7611.51414.917.68
805010/5515.9511.6712.02416.2420.32
806010/4524.625.213.61420.8216.75
806010/5021.619.314.12422.4119.04
806010/5519.215.2614.83224.7221.95