Nexus Bitherm

The Nexus Bitherm is a compact wall mounted interface unit suitable for studio fl ats 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 and bottom 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 lockable door
  • 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 rate l/minResidual pump head Δp-c kPaResidual pump head Δ p-v kPaPrimary pressure drop kPaPrimary return temp °C
702.545/353.58855350.18835.1
702.550/403.58855350.25740.1
702.560/401.79455310.2841.4
70545/357.17655370.76535.4
70550/407.17655371.06240.6
70560/403.58855351.3343.7
752.545/353.58855350.14435
752.550/403.58855350.18840.1
752.560/401.79455310.19440.6
75545/357.17655370.65135.2
75550/407.17655370.85840.4
75560/403.58855350.96142.3
802.545/353.58855350.12735
802.550/403.58855350.16140
802.560/401.79455310.16440.3
80545/357.17655370.51235.1
80550/407.17655370.6540.2
80560/403.58855350.69141.4
Heating Performance Data up to 10kW
Primary flow tempHeating outputHeating tempsHeating flowResidual pump headResidual pump headPrimary pressure dropPrimary return temp
°CkW°Cl/minΔ p-c kPaΔ p-v kPakPa°C
707.545/3510.7654421.42135.3
707.550/4010.7654421.92140.2
707.560/405.3855372.42343.4
701045/3514.3548442.56735.6
701050/4014.3548443.5640.8
701060/407.17655384.55544.2
757.545/3510.7654421.07935.2
757.550/4010.7654421.41940.3
757.560/405.3855371.56942
751045/3514.3548441.93635.4
751050/4014.3548442.55840.5
751060/407.17655382.9242.7
807.545/3510.7654420.84835.1
807.550/4010.7654421.07840.2
807.560/405.3855371.13641.2
801045/3514.3548441.51835.3
801050/4014.3548441.93340.4
801060/407.17655382.09141.9
DHW Performance Data up to 40kW
Primary flow tempDHW outputDHW tempsDHW flow rateDHW pressure dropPrimary flow ratePrimary pressure dropPrimary return temp
°CkW°Cl/minkPal/minkPa°C
703010/4512.316.628.15412.3917.19
703010/5010.812.828.63413.8920.11
703010/559.5710.069.3916.4324.13
704010/4516.3829.511.3123.819.22
704010/5014.422.812.10827.322.58
704010/5512.81813.3833.427.09
753010/4512.316.627.279.8515.79
753010/5010.812.827.56610.6718.09
753010/559.5710.067.99811.9221.16
754010/4516.3829.51018.617.61
754010/5014.422.810.4920.520.3
754010/5512.81811.2123.423.81
803010/4512.316.626.5948.114.7
803010/5010.812.826.7868.5816.55
803010/559.5710.067.059.2618.96
804010/4516.3829.59.01815.216.32
804010/5014.422.89.33616.218.53
804010/5512.8189.78617.821.35
DHW Performance Data up to 60kW
Primary flow rateDHW outputDHW tempsDHW flow rateDHW pressure dropPrimary flow ratePrimary pressure dropPrimary return temp
°CkW°Cl/minkPal/minkPa°C
705010/4520.544.213.90234.0218.36
705010/5017.9433.8514.80838.621.53
705010/5515.9526.7616.2446.4325.82
706010/4524.663.717.14251.719.75
706010/5021.649.118.40859.723.21
706010/5519.238.820.4273.427.83
755010/4520.544.212.34226.8216.83
755010/5017.9433.8512.929.319.35
755010/5515.9526.7613.71633.1222.67
756010/4524.663.715.13240.318.09
756010/5021.649.115.91244.620.87
756010/5519.238.817.04651.224.49
805010/4520.544.211.14821.8815.62
805010/5017.9433.8511.51423.3417.68
805010/5515.9526.7612.02425.4520.32
806010/4524.663.713.61432.616.75
806010/5021.649.114.12435.119.04
806010/5519.238.814.83238.721.95