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Good modulation is paramount and no other gas boiler manufacturer on the market comes close to Viessmann modulation. Poor modulation means a lot more cycles at the boiler when the outside temperature is not design temperature. This puts a lot of wear and tear on burner components and obviously not as efficient. A Viessmann cylinder will come with everything needed to plug into the boiler a run along nicely but you could choose another cylinder brand if you wanted to.
The Viessmann is already built for a 4 pipe set up with an internal diverter valve so PDHW is easily achieved. That valve can function as a one port outlet though if running new pipes to the cylinder is not possible and you have use external valves.
Vaillant are good boilers but in my opinion nothing comes close to Viessmann. That is just my opinion though.
The Viessmann is already built for a 4 pipe set up with an internal diverter valve so PDHW is easily achieved. That valve can function as a one port outlet though if running new pipes to the cylinder is not possible and you have use external valves.
Vaillant are good boilers but in my opinion nothing comes close to Viessmann. That is just my opinion though.