1) To comply with reg's boiler can be SEDBUK Aor B Band.
2)An extra expansion vessel may be required to accommodate expansion of increased volume of heating system water as a result of older cast rads having larger capacities per foot than modern low content rads. Also may require larger F/R pipework to carry
output requirement. EV WILL NOT aid noise supression on pipework, adequate clipping and insulation WILL.
