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I have a 40CDi combi boiler in a 1920s house. The heating does not get hot just warm. I have 22mm from the boiler to under the floor but then connects to original half inch/15mm copper lagged with hessian. I believe I am losing heat as some of the runs are quite long. A local plumber said I need 28mm flow and return at the boiler , connecting into the 22mm to increase the heat flow. What do you recommend. I can’t get under the floors because of laminate, vinyl and tiles. The plumber suggests connecting 28mm from boiler to 22mm where it goes into the floor downstairs and to the upstairs.