Megaflow with iBoost, supply cable?

[Custom45]

Hi,
With the Megaflow Eco Solar PV with iBoost and 2 x 3kw heaters, do the two heating elements work only one at a time? Manual states 1.5mm heat resistant flex input
is required, but this nowhere near enough if both elements are running?

The iBoost is already prewired to the cylinder with 1.5mm to each, so that's fine, but when making the mains connection 1.5mm seems to small.

Thanks,

 

[JohnD]

Follow the cable and see where it goes. Is there one switch and control, or two? Any timers?

Do they come from different circuits?

What is the MCB rating?

You can get a switch for the purpose than is "On/Off" and "Upper/Lower" when one circuit can supply either, but not both at the same time. Sometimes marked "sink/bath"

 

[JohnD]

Here we are

20A Dual Immersion Switch - Due 9th August | MK (K5208whi)

www.tlc-direct.co.uk

The iBoost can only supply one at a time. Yours may have a changeover control to supply first one, then the other, from a single circuit.

 

[JohnD]

iBoost and 2 x 3kw heaters, do the two heating elements work only one at a time?

Yes, if it has been connected correctly.

If not it will be overloaded and cut out or be damaged.

 

[Custom45]

Yes, if it has been connected correctly.

If not it will be overloaded and cut out or be damaged.

Sorry John, I wasn't clear... the Megaflow hasn't been installed yet, it's just been delivered, someone's coming next week to fit it, but I was browsing through the manual and noticed they said it only required a 1.5mm flex, which for 2 3kw heaters seemed a bit small to me.

The tank comes factory prewired, so the iBoost is mounted to the tank and has a 1.5mm cable running out to each element, installer just needs to fit the incoming cable.

But as you say, if the iBoost controls them so they only work one at a time then I guess it'd be ok. Thanks very much.

 

[JohnD]

1.5mm flex can carry about 16A if not enclosed. Your 3kW kettle probably has one.