Help with new Duo Immersion Heater

[wrighty208]

Hi, I'm hoping you guys can help me here. I've just bought a Backer Anti-Corrosive Duo immersion Heater (627C - 16" & 27" Elements) for my 5' tank.

Few questions -
1. Should the immersion have come with a washer as there is a note on the fitting instructions that says " The heater is fitted to the tank using the washer supplied (or a "water council' approved non-asbestos washer of at least 1.5mm in thickness"....If not where should I get one from or will there already be one on the tank (there is no immersion fitted at present!)

2. I currently have 2.5mm cable run from the Consumer unit to the airing cupboard - as this is a dual element immersion heater (sink/bath) should I get a sink/bath, on/off switch or just 2 double pole isolating switches?

3. The instructions say for hard water set the thermostats to 60 degree C but I see no way of setting this accurately - there are only +/- and 3 dots in between?

Thanks in advance for your help

 

[Softus]

1. Should the immersion have come with a washer

Yes, but you can buy them.

where should I get one from

Any plumbers' merchant.

or will there already be one on the tank (there is no immersion fitted at present!)

No.

as this is a dual element immersion heater (sink/bath) should I get a sink/bath, on/off switch or just 2 double pole isolating switches?

Your preference.

3. The instructions say for hard water set the thermostats to 60 degree C but I see no way of setting this accurately - there are only +/- and 3 dots in between?

Usually the 60ºC point is marked by a longer line than the other positions, otherwise it's trial and error - start low and work up.

 

[RF Lighting]

2. I currently have 2.5mm cable run from the Consumer unit to the airing cupboard - as this is a dual element immersion heater (sink/bath) should I get a sink/bath, on/off switch or just 2 double pole isolating switches?

Personally I think you would be better installing a proper selector switch. This will prevent you accidentally switching on both elements at the same time, which would overlaod the circuit and cause the OCPD to operate.


There is one here, and it will probably cost less than 2no. 20A DP switches.