def METHOD_NAME(build_unit):
    m = build_unit
    # platen superheater
    m.fs.unit.diameter_in.fix(0.035)
    m.fs.unit.tube_thickness.fix(0.005)
    m.fs.unit.fin_thickness.fix(0.0035)
    m.fs.unit.slag_thickness[:].fix(0.001)
    m.fs.unit.fin_length.fix(0.00966)
    m.fs.unit.tube_length.fix(40.0)
    m.fs.unit.number_tubes.fix(200.0)
    m.fs.unit.therm_cond_slag.fix(1.3)
    m.fs.unit.control_volume.scaling_factor_holdup_energy = 1e-8
    m.fs.unit.heat_fireside[:].fix(5.5e7)  # initial guess
    hpl = iapws95.htpx(798.15 * pyo.units.K, 24790249.01 * pyo.units.Pa)
    m.fs.unit.inlet[:].flow_mol.fix(24194.177)
    m.fs.unit.inlet[:].enth_mol.fix(hpl)
    m.fs.unit.inlet[:].pressure.fix(24790249.01)
    state_args = {"flow_mol": 24194.177, "pressure": 24790249.01, "enth_mol": hpl}
    initialization_tester(build_unit, dof=0, state_args=state_args)