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Most boiler controls systems with PDHW allow you to set the coil rating of the cylinder - well Vaillant’s do. If you’re using an external control the boiler will modulate accordingly as it would usually.You & others above mention where the boiler goes to full load, if the boiler is directed to full load and if its output is higher than the coil output, then what controls the boiler before it reaches its hi limit safety stat limit, does it cycle on/off until the cylinder temp is achieved.?.