Over sink water heater

[dereke]

We have recently had, professionally installed and tested, a new ring main and fuseboard, but had intended to install a 2Kw over sink water heater via the ring in a downstairs loo. Subsequently, she who must be obeyed, found a really small water heater, but it is 3.1Kw. Would we be OK connecting this to the ring? It will only be used briefly and occasionally. Any guidance much appreciated.

 

[Doc Hudson]

We have recently had, professionally installed and tested, a new ring main and fuseboard, but had intended to install a 2Kw over sink water heater via the ring in a downstairs loo. Subsequently, she who must be obeyed, found a really small water heater, but it is 3.1Kw. Would we be OK connecting this to the ring? It will only be used briefly and occasionally. Any guidance much appreciated.

Welcome to the forum, With all of these sorts of fixed appliances that do not connect via a 13a plug, you will need to look at the manufactures instructions to check what they specify are the connection requirements. It may just say connect to a suitably rated circuit via a 20amp double pole switch or a 13a double pole fused spur. Without seeing the specific item or its full specification I would guess that it would probably be OK connected to a ring final or non dedicated radial circuit, but you would need to be aware of any other loads connected to that circuit. Any links the the precise item you are looking at?

Doc H.

 

[dereke]

Hi Doc H-

This is a link to the heater proposed, just noticed it is 3.5Kw - Specsavers next - Above sink we have already installed a 20amp dp isolator for the supply to the unit.

The only other significant load on the circuit is the kettle.

Regards

dereke

 

[Andy™]

you cannot connect a 3.5KW load to a ring. it will need to have its own circuit, or find a heater than is 3kw

most heaters that store the water are 2kw - may be more beneficial to get one of those depending on its intended use

 

[dereke]

OK Andy, thanks for the input.

 

[m4tty]

The osg recommends any fixed load over 2kW should be on its own circuit

 

[Doc Hudson]

The osg recommends any fixed load over 2kW should be on its own circuit

Is that just water heating loads? Or that would rule out many standard domestic appliances, washing machines, tumble driers, etc {typically rated 2.7kW} that could be wired onto spurs fixed into kitchen units. Where does it say loads over 2.0kW m4tty?

Doc H.

 

[Andy™]

Is that just water heating loads? Or that would rule out many standard domestic appliances, washing machines, tumble driers, etc {typically rated 2.7kW} that could be wired onto spurs fixed into kitchen units. Where does it say loads over 2.0kW m4tty?Doc H.

not sure of any in OSG, but in appendix 15 it states 'cooker, ovens & hobs over 2kw' should have their own circuit. nothing about water heaters, other than the other reg of over 15ltr

 

[Doc Hudson]

[quote name='Andy