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  • FIRST POST
    • alexanderalexander
    • By alexanderalexander 8th Feb 18, 7:55 PM
    • 292Posts
    • 160Thanks
    alexanderalexander
    Three bathroom: megaflow, heatstore, or big combi?
    • #1
    • 8th Feb 18, 7:55 PM
    Three bathroom: megaflow, heatstore, or big combi? 8th Feb 18 at 7:55 PM
    Hello all,

    I've had my house massively extended, increasing it from one bathroom to three! So far I have kept my existing small combi boiler, but as expected it's not providing anywhere near enough hot water for three bathrooms. I've spoken to a plumber who has suggested three options and suggests they'd all be much of a muchness in terms of their efficacy:
    • Add a megaflow to my existing combi boiler. The disadvantage is that I have two separate bits of kit (boiler and Megaflow) to maintain or replace when they're worn out, but it would "only" cost about £1200 compared to around double that for the other two options.
    • Swap my boiler for one with an integrated hot water tank (I think it's known as "heatstore"), such as an Ideal Istor.
    • Swap my boiler for a high-capacity combi boiler (such as a Worcester Greenstar Highflow 550CDi) -- my plumber says I have very high mains water pressure so this would work.
    Does anyone have any thoughts as to which would be the most sensible? I have to say I'm finding it hard to get my head around how a megaflow actually works -- is it seamlessly integrated with the boiler system? Ease of use (no faffing around turning different apparatus on/off, or timing hot water etc.) is important to me.


    Very grateful for any help.
Page 1
    • Alex1983
    • By Alex1983 8th Feb 18, 8:07 PM
    • 771 Posts
    • 443 Thanks
    Alex1983
    • #2
    • 8th Feb 18, 8:07 PM
    • #2
    • 8th Feb 18, 8:07 PM
    Id go the mega flow route, assuming as you say the cold mains is good, zone it off you current heating system and just let your current combi run either a kitchen hot tap or one bathroom.

    Istors are possible the worse thing ive ever worked on.

    Highflows are good but only provide hot water at 20l per minute for a limited amount of time and then they fall back to a normal combis flow rate and they are very expensive.
    • SuzieSue
    • By SuzieSue 8th Feb 18, 8:10 PM
    • 3,757 Posts
    • 4,027 Thanks
    SuzieSue
    • #3
    • 8th Feb 18, 8:10 PM
    • #3
    • 8th Feb 18, 8:10 PM
    Id go the mega flow route, assuming as you say the cold mains is good, zone it off you current heating system and just let your current combi run either a kitchen hot tap or one bathroom.

    .
    Originally posted by Alex1983
    I agree with this. The other main advantage over the other 2 options is that you will be able to have hot water from the megaflo even if the boiler breaks down.
    • Typhoon2000
    • By Typhoon2000 8th Feb 18, 8:17 PM
    • 812 Posts
    • 387 Thanks
    Typhoon2000
    • #4
    • 8th Feb 18, 8:17 PM
    • #4
    • 8th Feb 18, 8:17 PM
    An unvented cylinder for sure. There are other brands just as or more reliable for less than a Megaflow.
    • alexanderalexander
    • By alexanderalexander 9th Feb 18, 3:50 PM
    • 292 Posts
    • 160 Thanks
    alexanderalexander
    • #5
    • 9th Feb 18, 3:50 PM
    • #5
    • 9th Feb 18, 3:50 PM
    Thank you very much to everyone for this help. It sounds like everyone's agreed that a Megaflo (or alternative brand of unvented cylinder) would be best.
    • fezster
    • By fezster 9th Feb 18, 4:42 PM
    • 239 Posts
    • 124 Thanks
    fezster
    • #6
    • 9th Feb 18, 4:42 PM
    • #6
    • 9th Feb 18, 4:42 PM
    Joule cylinders are highly rated and much cheaper than a Megaflo branded unit. I have the latter and wouldn't spend the extra on it.
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