Dimplex Quantum Boost energy source question.

Hatstand99

My daughter has recently had two Dimplex Quantum QM100RF (G7) storage heater installed in her one bedroom flat. They are each fed with a single feed and her whole flat is on a single meter with an E7 tariff. The overall control of the system is via the Dimplex hub and associated android app, although some of the settings need to be set on the heaters themselves. She uses the 'user timer' with 4 heating period per day, and everything seems to work as expected for the regular schedule. My question is about the boost function which she needs to use every now and again, and specifically how the energy source for the boost function is determined. (I'm asking here because I haven't managed to get an answer out of Dimplex and I thought that someone here might have 'practically' determined how it works.)

Within the heater settings, you can set whether the boost function just takes its energy from the heater core, or take it from the core and peak electricity. The option for core energy source only is straightforward, but it is the second option of core and electricity that is causing me problems.

In the manual, it states that "if boost mode is activated and there is not enough stored core energy, peak rate energy will be used unless disabled in heat source settings"

I initially read that as - if there is any heat energy in the core, then if you turn boost on, it will take the heat from the core until there is none left, and then it will use peak electricity. 

However, when I try to use boost, even when there should be plenty of core charge left, it uses peak electricity (I can see the usage on the electricity meter/supplier stats)

However, the manual statement could mean - if there is any heat energy left in the core AFTER the charging algorithm has decided that there will be enough to provide heating for the programmed schedule for that day, THEN use heat from the core until there is none left, and then use peak electricity. 

In the second case, if the algorithm considers that it does not have 'surplus' energy in the core, then it would switch to electricity usage straight away, which might explain the behaviour.

Has anyone any thoughts or experience of this ?

EssexHebridean

As I recall, the Quantums are smart so when using boost they not only work out how much stored energy is left, but how much will be required for later heat demands too. So if you turn the Boost on to gain additional heat mid afternoon, for example, when there is also a scheduled heating time set for say 1800 - 2100, then the heater will analyse if there is enough stored energy to cover both that later timeslot and the boost being demanded. If there is not, it will switch to peak rate for the boost. I may be remembering that wrongly though - I only very rarely used the boost on ours!