45 year old heating / hot water system

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I think I already know the answer to this question but I’ll post it anyway. Would anyone consider changing an existing 45 year old open vented heating and HW system to pressurised? The existing system is, in the main, hidden in walls or under flooring. The heating system is microbore and the main heating circuit has 2 distinct pockets.
British Gas are proposing to install a Worcester Bosch combi boiler in the current airing cupboard and top and tail the existing HW and Heating circuits to/from the current boiler, this would result in a heating circuit for the new system of approx 120m
If there is a leak in the old plumbing in say the kitchen this would involve the potential removal of laminate flooring, kitchen units, tiles etc etc. But there is little chance in reality of actually locating any underfloor leak until it had caused significant / noticeable secondary damage.
As I said in the beginning I think I know the answer, just want the reassurance of an echo chamber.
 
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The main driver for change was to take the 45 year old cold water and heating header tanks out of the system also the similar aged HW tank. Changing / replacing the tanks, due to loft hatch sizes, will be a huge challenge. Do they have to be so large? I estimate the cold water tank at 160 litres
 
There's your answer. Avoid BG like the plague. Go for an honest conscientious heating engineer who will look out for your interests not just how quick they can get in & out.
 
The main driver for change was to take the 45 year old cold water and heating header tanks out of the system also the similar aged HW tank. Changing / replacing the tanks, due to loft hatch sizes, will be a huge challenge. Do they have to be so large? I estimate the cold water tank at 160 litres
If the roof tanks are plastic they should be OK - look at " bylaw 30 kit " which would upgrade the insulation and cover the tank and make the overflow insect proof. If the hotwater tank is covered with spray on insulation it too should be fine - they tend to leak around the bottom - slowly so you'll see any water before it does damage- then change it. A picture of the roof tanks and the hot tank etc. And the size of your hatch would give a better idea;)
 
The hatch is 740x840, however I think the challenge would be getting a new tank past the roof trusses. Looked in more detail at the loft tanks, they are both looking fine, a bit of sagging in the sides on the CW, both are open topped and no insect kit as you would expect
 

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but that's generally not a problem.

It can be if
(1) existing taps cannot cope with higher pressure,
(2) showers can be painful to the skin
(3) water can "bounce" out of wash basins when the taps is opened too far.

When a combi boiler goes faulty you do not have the back up of an electric immersion heater to provide hot water.
 

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