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Hi all can someone give me some advice on what kw heater I can use with this speck
Fuse board b32 rcd
Cable 2.5.....10 metres long just for water heater (nothing else conected)
Water heater will be in downstairs clockroom and use just for hand washing.
What size in kw can I use and how can I connect
Thanks in anticipation........Keith
 
Hi thanks for your reply I had a new consumer unit fitted and the electrician was informed that it was going to be used for a small water heater.
A standard 2.5mm2 Radial would be on a 20 Amp OCPD
 
and it all depends on the installation method of the 2.5mm. if method C, then it's good for 6kW max. if in insulation, 3kW max. but that's pushing it to the limit, so I'd be inclined to downsize those figures to 5kW and 2.5kW respectively. as Rob said, the 32A MCB is OK as it's a fixed load.having said that, a site visit is needed to confirm.
 
and it all depends on the installation method of the 2.5mm. if method C, then it's good for 6kW max. if in insulation, 3kW max. but that's pushing it to the limit, so I'd be inclined to downsize those figures to 5kW and 2.5kW respectively. as Rob said, the 32A MCB is OK as it's a fixed load.having said that, a site visit is needed to confirm.
Hi telectrix thanks for your reply ......the cable runs under kitchen cabs up though a stud wall without insulation into a loft space above the insulation,so if I read your info correctly it will be ok with 3.5 to 4 kw ?
 
Best you get the circuit checked.

New circuits, like fuseboard changes fall under part P of the building regs
As i read it, the circuit had already been installed by a spark, but without a water heater on the end of it. OP wants to fit one and is asking for advice on what size he can get. even so, i's get a local sparks to check the circuit and advise accordingly.
 

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