Please can someone explain what sort of pipe runs a plumber would have made in this situation in a friend's house as it doesn't appear that it should work.
A new system boiler was installed downstairs with internal pump, replacing an old heat only boiler that had a header tank in the loft. The header tank outlet and inlet was disconnected where it pasess through the upstairs airing cupboard and the old header tank mains feed now goes to a filling loop connected to what was the outlet of the header tank going to the boiler, all in the airing cupboard upstairs. I'm told the hot water system was originally gravity fed.
Two motorised valves tee'd off the flow next to the boiler downstairs, one going to central heating and one for hot water. return from hot water and central heating teed together near the boiler
Importantly, the hot water tank in the airing cupboard appears to be a direct tank and only has three connections. (1) What looks to be 28mm cold feed from a tank in the loft going in at the bottom, (2)hot outlet at the top feeding the taps plus teed off up to the loft, presumably to a vent and (3)a 15 mm outlet about 2/3 up the tank going to a shower pump. I can see no coil connections on it to make it an indirect cylinder.
My question is, how is the system boiler heating the hot water in the tank without having an indirect cylinder with an internal coil, which would mean as a minimum 4 connections on the hot tank?
If it's any help there was apparently an issue fitting a new heat only boiler due to the possibility of it pumping over at the vent, maybe as the old system was gravity fed, so a pressurized system boiler was fitted.
A new system boiler was installed downstairs with internal pump, replacing an old heat only boiler that had a header tank in the loft. The header tank outlet and inlet was disconnected where it pasess through the upstairs airing cupboard and the old header tank mains feed now goes to a filling loop connected to what was the outlet of the header tank going to the boiler, all in the airing cupboard upstairs. I'm told the hot water system was originally gravity fed.
Two motorised valves tee'd off the flow next to the boiler downstairs, one going to central heating and one for hot water. return from hot water and central heating teed together near the boiler
Importantly, the hot water tank in the airing cupboard appears to be a direct tank and only has three connections. (1) What looks to be 28mm cold feed from a tank in the loft going in at the bottom, (2)hot outlet at the top feeding the taps plus teed off up to the loft, presumably to a vent and (3)a 15 mm outlet about 2/3 up the tank going to a shower pump. I can see no coil connections on it to make it an indirect cylinder.
My question is, how is the system boiler heating the hot water in the tank without having an indirect cylinder with an internal coil, which would mean as a minimum 4 connections on the hot tank?
If it's any help there was apparently an issue fitting a new heat only boiler due to the possibility of it pumping over at the vent, maybe as the old system was gravity fed, so a pressurized system boiler was fitted.
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