No, it should run outside in 15mm copper (usually, but some boilers can be plastic or 22mm copper) and ideally either down to approx 100mm from floor or kicked back to wall so if it discharges it does so safetly. Whats the pressure on the boiler ? (hot and cold). I think these boilers are filled with a 3 way tap underneath on the right hand side, make sure the handle is in the correct position.
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