Priority domestic hot water PDHW

[DAVE01]

And am I right in thinking the x plan is this which ramps boiler up to match cylinder coil rating? Does the primary flow temperature ramp up as well to match the 80-85°c most cylinders state their reheat times at?

Take a look at the ideal vogue It has two relays For switching or use a w plan you can have both heating and hot water on at the same time but you can use a 3 way divirter valve This will get PHHW and when satisified It changes over to heating But use a Fast recovery cylinder as you well Know . Or if you have say a S plan Plus You can use a Normaly open Motorised Valve Before all Circuits were the normaly open will go to your Hot water cylinder controled by a Cyc Stat then when hot water is satisified you will have heating. And Take a look at intergas UK they have it well sussed For PHHW . Only fitted a Vokera Vision Plus You can range rate this boiler and it has a Stainless Heat exchanger But to have weather comp or open therm you need two relays . But try inter gas Uk Or Visemann . I an looking for a fast recovery cylinder in ireland its like i am speaking martion