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Discuss Combi Boiler Modulation with Genius Hub TRV's in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. Andrew Westrope

    Andrew Westrope New Member

    I currently have a 17 year old Ariston Microgenus 27MFFI boiler that is getting increasingly noisy so looking to replace rather than spend money on. It supports my DHW requirements with regard to a decent shower but I don't want to go less. I have found online that it will produce 35 degree increase with a flow of 11.4L/min. This seems high compared to modern boilers of a similar size?

    I have 7 rads all with TRV's controlled using the Genius Hub (was Heat Genius) system. I live on my own so tend to just heat where ever I am so the heating demand is often quite small.

    My logic translates this to needing a boiler that will modulate as low as possible. Also having a bypass system that is quiet and reliable.

    To my questions:
    1. Is my logic correct re modulation and bypass?
    2. Is the DHW flow rate of the Ariston correct?
    3. Which boilers have the largest modulation?
    Thanks for any help.
     
  2. sammathias

    sammathias Plumber GSR

    most modern condensing boilers are fitted with an auto bypass inside the boiler.

    the ariston flowrate is correct, say a new vaillant or glowworm can modulate to as low as 5 or 4kw but the heating load can also be adjusted upon set up. also I believe say a glowworm energy 25kw is 11.5l at 30c rise.
     
  3. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Agree with the above but I would still have an external bypass fitted or a heat leak rad in the bathroom

    And also have a look at Viessmann either 100w or 200w
     
  4. Andrew Westrope

    Andrew Westrope New Member

    I have been recommended an Alpha Intec 2 28kW (modulates down to 3.5kW, DHW flow 11.7) by an engineer who I have used before for new rads and he installed a WB at my sisters recently that went well. Any comments on that boiler?
     
  5. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Lower end boiler but ok
     
  6. Andrew Westrope

    Andrew Westrope New Member

    Been quoted £325 more for Ideal Vogue 26 than Intec2 28. I expect to keep the house for the life of this boiler. Which would you choose?
     
  7. Andrew Westrope

    Andrew Westrope New Member

    Been quoted £325 more for Ideal Vogue 26 than Intec2 28. I expect to keep the house for the life of this boiler. Which would you choose?
     
  8. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Why has he recommended you an Alpha but your sister a WB?
     
  9. Andrew Westrope

    Andrew Westrope New Member

    WB don’t do anything that modulates low enough for me.
     
  10. Chalked

    Chalked Plumber GSR

    Why are you being so obsessed with modulation? Which in the right situation, will save you a few ££ a year. When a decent make of boiler, will save you a lot more in the long run.
    Ps, I hate both of your options and would fit a vaillant.
     
    • Like Like x 2
  11. Gasmk1

    Gasmk1 GSR

    fit a vaillant with their controls
     
    • Like Like x 1
  12. Andrew Westrope

    Andrew Westrope New Member

    It’s not really about the money, it’s more about having a boiler that is designed to be used in my situation and won’t be cycling constantly.

    The Vaillant iQ green range has good modulation but only goes down to 35kW which is massive overkill and £1500 for just the boiler

    Of the ‘decent’ makes of boiler the Viessmann is the only one with decent modulation but I can’t seem to get anyone to quote me for one of those!
     
  13. Andrew Westrope

    Andrew Westrope New Member

    What do the Vaillant controls offer over the Genius Hub ones?
     
  14. Gasmk1

    Gasmk1 GSR

    probably cost just priced up my apartment 7 rads £946.00
     
  15. Gasmk1

    Gasmk1 GSR

    we have installed a few of them now and the wireless one i never know the numbers my mate orders them i just wire them last job was 2 heating circuits and 1 unvented with weather compensation.

    the viessmann is still the best weather compensation but you should insatll the 200 boiler controls are far superior to the 100.

    wherabouts are you
     
    • Agree Agree x 1
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