Loft Conversion

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Norfolk
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United Kingdom
We are currently planning a loft conversion and require some independent plumbing advice. We have a conventional boiler which was recently installed to allow for extra heating demands due to the loft once converted and do not wish to change this. Once the conversion has been completed there will be four bathrooms – two with a bath and power shower, one with just a power shower and the fourth is a cloakroom with just a toilet and sink. There is a large vented heated water tank in the in the airing cupboard and in the loft there are three cold water tanks, although these can be moved to another loft area which is not being used for the conversion. We do not wish a combination boiler, due to difficulties when using more than one hot water outlet at the same time together with the loss in water pressure when other demands are put on the system. Also I understand you cannot use a combination boiler with power showers? Given these criteria what plumbing system would be best suited? Is it possible to use either a pump or even a second bolier? Many thanks.
 
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Keep existing system as is and use unvented cylinder in the loft
for hot water.
My advice would have been to rip the lot out showers and all and
put a system boiler in and unvented cylinder you could then have removed
header tanks form the loft. You will be able to convert your existing conventional boiler to a sealed system and therefore remove the central heating header tank from the loft which will be a good idea if you want radiators up there.
Pity you started out on the wrong foot.
 
We are currently planning a loft conversion and require some independent plumbing advice. We have a conventional boiler which was recently installed to allow for extra heating demands due to the loft once converted and do not wish to change this. Once the conversion has been completed there will be four bathrooms – two with a bath and power shower, one with just a power shower and the fourth is a cloakroom with just a toilet and sink. There is a large vented heated water tank in the in the airing cupboard and in the loft there are three cold water tanks, although these can be moved to another loft area which is not being used for the conversion. We do not wish a combination boiler, due to difficulties when using more than one hot water outlet at the same time together with the loss in water pressure when other demands are put on the system. Also I understand you cannot use a combination boiler with power showers? Given these criteria what plumbing system would be best suited? Is it possible to use either a pump or even a second bolier? Many thanks.

Just had a rethink.
1. Convert existing boiler to sealed system. Therefore no need to central heating header tank in loft.
2. Remove old hot water tank and replace with unvented cylinder.
3. Use pressure reducing valve to reduce pressure to rest of house to 1 bar for power showers (if the powershowers are ok with high pressure then leave it at that). Loft can be at full pressure.
4. You can remove cold water header tank from loft.

This is assuming you have sufficient flow and pressure of mains for unvented cylinder.
 

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