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If you forgo a gas safe registered engineer and try installing

If you forgo a gas safe registered engineer and try installing the boiler on your own, you still need a certified and competent professional to test, accept, and sign it however, a reliable engineer will likely be hesitant to commission a boiler that they have not personally fitted. Most conventional steam boilers are classed as either fire-tube or watertube types in the fire-tube type, the water surrounds the steel tubes through which hot gases from the furnace.

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