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Should I change from regular boiler to System boiler

Discussion in 'Plumbers' Talk' started by Jake Mamo, Dec 31, 2020 at 5:56 PM.

  1. Jake Mamo

    Jake Mamo New Member


    I am refurbing my first house that currently has an open vented system installed. All works well except for a leak that was coming from the heating header tank which ruined the ceiling below it. I've fixed this but I don't know if I will keep having problems with the tanks.

    I was planning to change the whole system to a combi to get rid of the tanks in the loft so I don't ever have this problem again.. the problem with that is it will cost around £2500.

    I am wondering if switching from this open vented system to sealed system would be a good idea considering everything else works fine and I just want rid of the open tanks..Would this be an easier swap than changing to a combi? Would this be more cost effective? Should I consider other things like the pressure in the new sealed system affecting the old pipework?

    Any advice is appreciated.

    Last edited: Dec 31, 2020 at 6:05 PM
  2. candoabitofmoststuff

    candoabitofmoststuff Screwfix Select

    Well... yes, but that will be a consideration if you change to a combi as well, so it's just something you're going to have to think about...

    Having said that if the current pipework can't hold the pressure that will be needed I think it's an issue anyway!

    For what it's worth, when I had my system changed to a pressurized one about 8 years ago, lots of the original pipework stayed in place and has caused no problems. I don't know how old it is, but the house was built in 1959, and the pipework is/was imperial. I suspect the central heating dates from the 70's... (but I don't know that for sure!)

    Good luck,

  3. MGW

    MGW Screwfix Select

    Changing from system to combi does depend on the fuel used, seems with oil they simply fit a storage tank inside the boiler, as oil boilers don't modulate, but with gas often you can select if the in boiler storage is used or not.

    With mothers, a Worcester Bosch eco means no storage, so eco on and you need a fair flow at taps to get hot water, but with the shower, eco off, starts cold goes warm then store runs out so goes cold and only when warm for second time could you use it. Also change from system to Combi resulted in removal of power shower so shower pressure dropped.

    As to bath, stored water bath fills fast, but with combi it takes an age. And with stored water and solar panels the excess is used to heat the water, you loose that option with a combi.

    I have lived in the old house for some 30 years without a header tank, not combi, two independent gas boilers, where the tank was made into a bedroom, then an office, but pipes still large, so there is a lot of water in the system, so kitchen tap would fill a bowl of cold water before the hot arrived, connecting dish washer and washing machine to hot helped keeping hot water in the pipes, this house back to header tank, and we are starting to enjoy baths again.
  4. Crowsfoot

    Crowsfoot Screwfix Select

    As above a combi is all about flow rates on the hot water side and if you can manage with them? Also no I/Heater back up if a combi goes down.
    With a system boiler you will still loose the header heating tank because the heating side is pressurised just like a combi, however, you will keep the MST, cylinder and most importantly the Immersion Heater back up.
  5. Tilt

    Tilt Active Member

    I cannot see why you should have problems with the tanks if they are properly installed, properly supported and properly insulated. Ideally with a lid on too.

    If you want to remove them because they are in the way then that is a different matter and a system boiler may be a good choice but
  6. graceland

    graceland Active Member

    £2500 for a combi conversion is quite cheap depending on brand of boiler, length of warranty etc. If you have high flow rate on your mains water into the property there are combis that can utilise that and run two showers at the same time or run a bath very quickly. All depends on your flow
  7. Bob Rathbone

    Bob Rathbone Screwfix Select

    If you go down the combi route fit the biggest rating you can get if you need a good flow rate on DHW, the boiler will modulate it's output for CH.

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