Dimplex Quantum QM150 Storage Heater Off-Peak Supply Wiring Help | on ElectriciansForums

Discuss Dimplex Quantum QM150 Storage Heater Off-Peak Supply Wiring Help in the Talk Electrician area at ElectriciansForums.net

B

bigp26

Hi All,

I hope you are all enjoying your weekends!



Before I start, I just want to thank you for your help in advance…

To summarise, I had storage heaters installed a few weeks ago by an installer, and have experienced a few problems!

To cut a long story short, the flat I moved into used to have horrible storage heaters in the living room and hallway, which I replaced with electric panel heaters. I was told that my bills would go sky high (which they did), however at the time, I was a bit stuck as my refurb budget had run out.



Fast forwarding to a few weeks ago, I had 3 Dimplex Quantum heaters installed. Now the Quantums in the living room and hallway seem to be fine (as the off-peak supply was already there, ready to be connected up via a fused spur), however the bedroom Quantum has given me some issues.

As there was no storage heater in my bedroom before, there was no off-peak supply. As such, the electrician made the suggestion of simply plugging the off-peak element end of the heater via a normal 3 pin plug into a normal socket, via an electronic timer (to emulate the switching at off peak times to take advantage of Economy 10).

I asked him if this was safe, and he said yes it was safe, and that it is a much better solution than having to pull a new cable from the other side of the property (literally the other side!). This gave me comfort as I know this electrician also performs electricity safety tests for properties. The DImplex Quantum QM150 was therefore installed in my bedroom using this setup.



Now for the issues:

1) About 2 weeks ago, I found that the heater wasn’t charging up with off-peak electricity, and thus wasn’t giving out any heat at any time.

Having investigated this, I found that the switch for the socket that the 3 pin plug was plugged into, was stuck. I was thus unable to switch it from on and off.

To test this, I plugged in my iPhone charger and confirmed that no electricity was being output even with the switch in the on position. I put this down to a cheap switch that had gone faulty, and simply replaced it.



2) Last night, I could hear some buzzing/crackling from the off-peak socket whilst I was in bed. I therefore went closer to investigate, and smelt a little bit of electrical burning (similar to when using a soldering iron). As such, I quickly turned the switch off and took the plug out of the socket.

What I found was that the front of the timer socket (i.e. where the 3 pin plug goes into), was very slightly melted. I also found that the plug was slightly melted on the neutral side. Opening the plug up, I could see that there was damage on the neutral connection of the pin (i.e. to the plastic and screw etc.). Obviously the front of the plug was warm to touch at this point too.​



This has made me extremely worried, and I have been doing a few hours of research this morning.

I understand that the off-peak elements of storage heaters are not really suited to be simply plugged into normal sockets (apologies if my terminology is incorrect, but I understand that the normal sockets are connected to the 30A ring main, and similarly, off-peak elements shouldn’t be connected to 30A ring mains).

I have also read that the storage heaters should be connected with 2.5mm wire (both from the heater to the socket, and from the socket to the fuse box).



So I’m just weighing up my options before I go back to the install company and start making a fuss:


Option 1:

I noticed that the connection between the plug and the timer socket wasn’t great i.e. the pins didn’t sit completely flush into the socket, but sat with a 1-2mm gap. Assuming that this was the issue (i.e. poor connection), the first option is to replace the plug and replace the timer with different models, which are a bit more compatible with each other and therefore don’t exhibit the 1-2mm gap.


Option 2:

Get rid of the socket and the plug, and replace this all with a Greenbrook T205-C Fused Timer Spur.


Option 3:

Ask the installer to come back and put in a new 2.5mm wire from the off-peak supply fuse box to my bedroom.


Out of the 3 options, my least preferable option is number 3, as the fuse box and the bedroom are literally on opposite sides of the property, which will mean lots of ugly trunking.

Option 2 therefore makes the most sense to me, but obviously this means that the off-peak element is still using the 30A ring main. The wire going from the heater to the socket looks like 2.5mm to me, but I think the wire going from the fuse box to the socket looks like 1.5mm (I’m not 100% sure about these wire sizes though – any easy way to confirm?). Considering these points, should this setup be OK?



Thoughts and suggestions would be much appreciated.

Kindest regards!
P.
 
Last edited by a moderator:
IMHO you should get the original installer back or get a 2nd opinion, but I think running an additional off peak supply is probably the best option.
 
The QM150's storage input (if I remember rightly) is 3.3kW which translates to about 14A (voltage dependant). This obviously means you will have issues with any workaround involving a fuse. It should be supplied from a 20A dp sw on a dedicated circuit, meaning the only option for me would be number 3. It would also be worth noting that it's not common practice to have storage heaters in bedrooms although this doesn't mean you shouldn't.
 
Why isn't it common practise for storage heaters in a bedroom Resu? I just wondered........
I'm not sure tbh. I have worked in/tested hundreds of properties with E7/E10 or THTC setups and not one of them had storage heaters in the bedrooms, it was always panel heaters in the bedrooms. Thus leading me to believe it wasn't common practice!
 
Many thanks for your advice so far. Very much appreciated.

I've been exchanging emails with the installer all day, so I thought I would provide an update.

They have been very apologetic, and the last email I received said the following:


"Can you tell me what series your heater is please? (Under the flap on top it should say Series G or F or E, etc. If it is a G it can be programmed without the use of a timer.

If it is not a G then it will need a suitable timer capable of switching 3.3KW wired in correctly to a 20amp double pole isolator.

The heater will also need the 24hr supply for the timer/programming side which you already have with the socket outlet.

This arrangement has been okayed by Lawrence at Dimplex providing that the off peak supply isn’t on a plug top and correctly isolated (20amp double pole isolator)."

Any thoughts from you experts?
 
Thanks Murdoch! In a bit of a strange situation now as the installers are quite reputable in the area, and if I were to go elsewhere I would have to pay again (having already forked out over a couple of grand with these guys). I would have thought they would have been able to do a proper job/give sound advice, but seemingly not!

Find an electrician who knows what he is doing!
 
Thanks Murdoch! In a bit of a strange situation now as the installers are quite reputable in the area, and if I were to go elsewhere I would have to pay again (having already forked out over a couple of grand with these guys). I would have thought they would have been able to do a proper job/give sound advice, but seemingly not!

Who made the decision to spec the specific heater? Seems to me that this is the problem.... or rip the thing out and fit a panel heater with a timer!
 
Dimplex themselves spec'ed the heater having been provided with my floorplan and room sizes.

Problem is that I actually had a panel in the bedroom before, but thought I would get the Quantum installed as I was getting the other 2 installed anyway, and thought I'd make that extra investment for the longer term saving (my bills were sky high with panels all around!).

Who made the decision to spec the specific heater? Seems to me that this is the problem.... or rip the thing out and fit a panel heater with a timer!
 
Many thanks for your advice so far. Very much appreciated.

I've been exchanging emails with the installer all day, so I thought I would provide an update.

They have been very apologetic, and the last email I received said the following:


"Can you tell me what series your heater is please? (Under the flap on top it should say Series G or F or E, etc. If it is a G it can be programmed without the use of a timer.

If it is not a G then it will need a suitable timer capable of switching 3.3KW wired in correctly to a 20amp double pole isolator.

The heater will also need the 24hr supply for the timer/programming side which you already have with the socket outlet.

This arrangement has been okayed by Lawrence at Dimplex providing that the off peak supply isn’t on a plug top and correctly isolated (20amp double pole isolator)."

Any thoughts from you experts?

So dimplex have pretty much confirmed that you need the job to be done properly and not bodged via a plug, since you can't fit an unused 20A DP switch directly to the ring circuit.
I think you should be getting the original installer back to do the job properly at their own cost seeing as they deliberately overloaded a 13A socket and created a fire risk.
 
Ahh - didn't realise the 20A DP switch can't be connected to a ring main, but thinking about it now it kind of makes sense.

The installer obviously doesn't know this however, as they have taken Dimplex's advice as being (in simple terms): where the plug was plugged in via a timer, remove the plug socket, replace with a 20A DP switch, and connect the off-peak element to the new switch.

So dimplex have pretty much confirmed that you need the job to be done properly and not bodged via a plug, since you can't fit an unused 20A DP switch directly to the ring circuit.
I think you should be getting the original installer back to do the job properly at their own cost seeing as they deliberately overloaded a 13A socket and created a fire risk.
 
So dimplex have pretty much confirmed that you need the job to be done properly and not bodged via a plug, since you can't fit an unused 20A DP switch directly to the ring circuit.
I think you should be getting the original installer back to do the job properly at their own cost seeing as they deliberately overloaded a 13A socket and created a fire risk.

Don't you mean unfused Dave ?:wink5:
 
Dimplex themselves spec'ed the heater having been provided with my floorplan and room sizes.

Problem is that I actually had a panel in the bedroom before, but thought I would get the Quantum installed as I was getting the other 2 installed anyway, and thought I'd make that extra investment for the longer term saving (my bills were sky high with panels all around!).

So who decided not to install an E7 circuit? I bet that wasn't Dimplex!
 

Reply to Dimplex Quantum QM150 Storage Heater Off-Peak Supply Wiring Help in the Talk Electrician area at ElectriciansForums.net

News and Offers from Sponsors

  • Article
Join us at electronica 2024 in Munich! Since 1964, electronica has been the premier event for technology enthusiasts and industry professionals...
    • Like
Replies
0
Views
438
  • Sticky
  • Article
Good to know thanks, one can never have enough places to source parts from!
Replies
4
Views
1K
  • Article
OFFICIAL SPONSORS These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then...
Replies
0
Views
1K

Similar threads

I am a landlord/owner of a flat. I am just about to spur off nearby sockets to provide the additional 24hr supply to new Dimplex Quantum storage...
Replies
0
Views
1K
M
This old thread has a short video which seems to reinforce your description (see post #2) but doesn't help much...
Replies
1
Views
269

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

YOUR Unread Posts

This website was designed, optimised and is hosted by untold.media Operating under the name Untold Media since 2001.
Back
Top