Separation of switch from electric heater

What is the min side-separation between a heater and wiring accessory - 25mm?
The instructions require 75mm from combustible surfaces & located not below a wiring accessory, but say nothing about how close a wiring accessory can be from their side.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.