Hope you can help with the following plumbing queries:
1) my house originally had a cold water cistern but was ripped out and replaced by a combination boiler to provide heating. After the stopcock I have 22mm copper pipe which originally fed the cistern. Can i reduce this 22mm to 15mm pipe? The 15mm will then supply the rest of the cold water supply i.e. kitchen sink, combination boiler, bathroom sink, wc cistern, shower. As you know baths are 22mm so that would mean changing from a 15mm to a 22mm just below the bath. Would that be okay? Everything mentioned above will be under rising mains pressure.
2) because of building regs I have to install an air admittance valve (durgo) in my bathroom. What is the minimum height i can install this. Does it just have to be above the outlet of the wc ( which is quite low anyway)
3) I have a combination boiler and can't seem to find a drain valve. My boiler is on the bottom floor. Would it be possible that the installers never put in a drain valve? Or can the drain valve be in the boiler itself? If i were to put in a drain valve does it have to be at the lowest point of the sealed system? This would be under the floorboards which would mean if i fixed a hose to it the water would only drain out all the water above the outlet of the hose and leave all the water below the outlet of the hose still in the sealed system. Is this right?
sorry for being longwinded but so much to ask
thanks in advance
1) my house originally had a cold water cistern but was ripped out and replaced by a combination boiler to provide heating. After the stopcock I have 22mm copper pipe which originally fed the cistern. Can i reduce this 22mm to 15mm pipe? The 15mm will then supply the rest of the cold water supply i.e. kitchen sink, combination boiler, bathroom sink, wc cistern, shower. As you know baths are 22mm so that would mean changing from a 15mm to a 22mm just below the bath. Would that be okay? Everything mentioned above will be under rising mains pressure.
2) because of building regs I have to install an air admittance valve (durgo) in my bathroom. What is the minimum height i can install this. Does it just have to be above the outlet of the wc ( which is quite low anyway)
3) I have a combination boiler and can't seem to find a drain valve. My boiler is on the bottom floor. Would it be possible that the installers never put in a drain valve? Or can the drain valve be in the boiler itself? If i were to put in a drain valve does it have to be at the lowest point of the sealed system? This would be under the floorboards which would mean if i fixed a hose to it the water would only drain out all the water above the outlet of the hose and leave all the water below the outlet of the hose still in the sealed system. Is this right?
sorry for being longwinded but so much to ask
thanks in advance