What are the expected resistance readings for the Quantum and XLE/Slimline storage heater elements?

Modified on Tue, 3 Sep at 9:38 AM

The elements in a Quantum or XLE/Slimline storage heater can be checked by an electrician to verify they have the correct resistance.

WARNING. The appliance must be safely isolated from both mains supplies and proven dead before carrying out any work!

Each element can be measured individually using a multimeter and the resistance reading compared to the table below. In order to measure the resistance of only one element at a time, removing the spade termonal wire from one side of the element should be done to ensure only one element is being measured.

Storage Element - per element
Quantum & Slimline Sizes	Ohms (approx)
50	169
70	108
100	71
125	61
150	50

On Series A to G Dimplex Quantum, there was a 4th element for Boost only use, at the bottom of the heater. The resistance of that is as follows:

Heater Size	Resistance (Ohms) approx.
50	149
70	95
100	66
125	51
150	41

If an insulation resistance test is performed on elements, it can be done tested to 500v and would be tested between element sheath and element terminal and the anticipated insulation resistance would be at least 1Megohm. As the elements are mineral insulated, running the element for a few hours can often drive out any moisture and the element may then return to >1Megohm insulation resistance if seen to be below this on an initial test.

Applicable to: QUANTUM QM050 QM070 QM100 QM125 QM150 QM050RF QM070RF QM100RF QM125RF QM150RF XLE050 XLE070 XLE100 XLE125 XLE150 HSDHHR050 HSDHHR070 HSDHHR100 HSDHHR125 HSDHHR150 AC6550 AC6551 AC6552 AC6553 AC6554 DESE050 DESE070 DESE100 DESE125 DESE150 HSDS050 HSDS070 HSDS100 HSDS125 HSDS150 NLSH050 NLSH070 NLSH100 NLSH125 SSHE050 SSHE070 SSHE100 SSHE125 SSHE150 TSRE050 TSRE070 TSRE100 TSRE125 TSRE150