Hot water problems with shower

Yes we find this. Mr VB says the electric heating element is placed higher in the tank than the gas one, which is at the bottom of the tank. As someone else has said - you can run both together to ensure you have plenty of hot water. Sounds like a miserable experience you’ve got now, hope you can get it sorted. 

although I've no experience of this, there may be some logic in the 'position' theory giving slightly more hot water when using gas than electric.

but it seems for most users, even using electric, there is sufficient hot water for a couple of showers...

i might have a look at the Truma diagram.......sad git, lol...

We find our truma if needing more hot water just put the boost on

The water will heat quicker on gas than electric. The cold water going into the tank will, therefore, not have such a dramatic cooling effect because it’s heating quicker.

I seldom wash my long hair in the van/MH, purely and simply because I use too much water trying to get all the conditioner out. Prefer to have a decent shower using onsite facilities. Two showers with hair wash/condition was fine when I had short hair. You also need a decent pressure to rinse conditioner out. I have debated having hair cut a few times.......

I doubt even a 6kw gas burner can heat cold water to shower temperature as fast as it enters the system.....one thing it isn't, is an 'instant' type system.

yes, the minute or two between two people showering might have more heat loss replaced using gas than electric but marginal in the extreme in the tiny time frame...

try draining the dank of hot and then get in the shower and it will be pretty apparent....irrespective of heat source...

Re: the boost function....there is much confusion as to its purpose.

it is not a setting to miraculously give virtually instant hot water, the unit is not capable of this....

even in 6kw gas only mode, I would expect the average heating time to 60 deg to be 20 mins or so..

what Boost does do is prioritise hot water heating over room heating when both heating and hot water are selected....

under normal operation it's the heating that's priority, with water heating as a by product.

it also raises the water temperature by 2 deg, to 62 deg. whether this slight rise might give a longer 'mixed' temp shower is debatable but every bit helps I guess.

from the Combi CP Plus operating instructions manual....

Change Hot Water Level

off - Hot water generator is switched off.

Eco – Hot water temperature 40 °C

Hot - Hot water temperature 60 °C

Boost - Targeted, rapid heating of boiler contents (Boiler priority) for a maximum time window of 40 minutes. Then the water temperature is kept at the higher level for two post-heating cycles (about 62 °C). After reaching the water temperature, heating of the room continues.

We have an Alde system which I think is a 8 litre hot water tank. We only use it on Electric and normally only on a service pitch. I like a reasonable shower, so allow the tank to heat up again (30 mins) after the OH has showered. There is a noticeable difference in the length of shower if boost 70C is used, rather than the standard 60C . There is also a noticeable difference between length of showers winter and summer. Presumably because the replacement water is that much colder in winter. Although I assume that wouldn't be as marked with a MH's inboard tanks.

However, summer or winter, on either setting, there is ample for a good long shower. Sufficient to wash hair and body without turning off. Although I do because, of the showers small size, the soap would wash off before applied.😂 We have an eco camel shower head, which I think makes the available water stretch significantly further.