Sealed or vented?

[Blackcatgas]

What do you think, is 10 litres per minute a sufficient mains pressure to use a sealed system, delivering sufficient cold water to 4 showers at the same time and still have a decent pressure and not major temperature changes when the dishwasher kicks in?

Not a chance in hell. Be honest, how many times does the situation arise where all four of you are having a shower?.

 

[BLOD]

I Agree with Blackcatgas

 

[oldplumber]

stick in at least one electric shower in your house, at least youll have the ability to wash when the boiler breaks down.

 

[Dannypipe]

The problem here is that there isnt a 'wrong' answer, just various opinions.

I'm fitting two boilers, linked in a very large house.This house is at least 6 bedrooms. It has 5 bathrooms. The system we're linking into was fitted ten years ago...by someone who was obviously very skilled and knowledgeable.

It is a open vented hotwater cylinder, with various flanges cut into it, supplying Stuart Turner pumps to all showers. The cylinder is huge. Then the central heating is a sealed system.

The pipework from the cold water storage tank is in 42mm, maybe bigger I'm going from memory here. Anyway, the system works very well. I was chatting to my work mate about the system and the total cost of all those pumps + the huge copper cylinder meant he could have just as easily had an unvented for less money. However we did realise that the demands on the house (at peak use) may exceed what an unvented can do. The jury is out.

We're bodering on light commercial so it would probably be advisable to speak to a plumber with experience in this field. Oh and if one of the boilers breaks down in the place I'm working on at the mo, then the other boiler could tick things over until it got sorted. We've linked a sequenser in for summer time to alternate the boilers and therefore lower fuel/service costs.

Who ever gets to do the job the OP is after is lucky. Jobs like this are what it's all about for me.