Dave Liquorice wrote:

On Thu, 9 Feb 2017 01:10:39 -0800 (PST), wrote:

presently there is an C6 MCB can I replace it to 16 to resolve this
problem

Assuming that you really mean MCB then you need to find the reason
for the instant overload.

If it is a two or three kilowatt heater the result is unsurprising.

--

Roger Hayter