External pump wattage limit query

[Lostloop]

I notice the Worcester 24Ri lists pump wattage as '90 watts max.' The older 3 speed Grundfos Selectric pumps have a rating of 105 watts on speed '3'. What happens in this case when the existing pump is still quite serviceable ? Do you disable the top speed ? Place an advisory sticker on the pump: 'Do not use setting '3' ? Or are they routinely replaced for the newer, lower wattage types ? Thanks for any responses.

 

[heliotrope]

No need to do anything. Watts is the power consumed by the device.
The pump will take as many watts as it needs to run at any given speed.

 

[Roger Welton]

If you want to keep the existing pump and it is rated over that of the appliance (more W = more A drawn) supplying it you would need to add a relay (or just change the pump)

 

[Lostloop]

So it's the contact rating of a small relay on the PCB (?) that is the limiting factor - and that would require a larger 'slave' relay to operate a higher wattage pump.

 

[heliotrope]

No!

Fifteen Watts is nothing, about the same power consumption as a
cooker hood light bulb.

If you want to bung in a pump pulling FIFTEEN Watts more then just
do it!:whatchutalkingabout