No, they don't. They have one simple insulated tank with a heating element inside a tube that is immersed in the water. As the element is usually inserted from the bottom of the tank, it can easily be replaced without draining the tank. Why would it have two separate tanks?

That is what I read in the technical blurb that accompanied the boiler !

Cheap low tech solution to try: add a water restrictor between the between the shower head and hose? Might not fix the problem completely, but showers could last for longer.

I was reading about them but I also read that all shower heads are already supposed to have them 🤔

Could it be that as you like your shower quite hot and the boiler temperature to me doesn't seem that hot ,that the the thermostatic mixer you have is sensing the water doesn't need mixing with cold water. Therefore it simply running straight on hot water using your tank capacity quickly? I would try putting boiler temperature much higher that way the thermostatic mixer will adjust temperature of water coming out by mixing and increase amounts of hot water you have available. That may resolve the issue certainly worth trying before going to more expense?

Couldn't say but at 14L/min it wouldn't hurt to try. Ours is fitted with them and it makes a difference.

Good idea, I know what you are saying which makes sense but we would get scalded when the hot water eventually came through if say we increased it to say 65c, as when it first comes through it is too hot to stand in and you have to wait about half a minute for it to cool down, which makes me wonder whether the thermostat is working correctly. The valve was adjusted to allow the water to come through up to 45c, is that scalding temperature because it is too hot to stand in when it first comes through.

I think I need to ask a plumber if it is fitted with one. Or maybe it mentioned it in the sales blurb, I will have to take a look.

If the issue is that you have very high water pressure which is pushing out all the hot water from the tank quickly why not just reduce that amount at the shower bar? Don't have it on full. When I converted our water to increase pressure as it was feeding into the deposito from mains and then feeding the house water from the deposito by gravity , the standard way most older Spanish properties work. I was advised by someone who was a plumber in the UK how to add a few pipes so that the mains fed direct to both the deposito and household water supply. He said the mains pressure would be too high and to put a water pressure reduction valve in the system more or less where the mains entered the house. I did that and all was fine until around 18 months ago when our household pressure reduced significantly. I thought it must be to do with actual supply maybe reducing pressure to conserve water as measures were being taken to conserve water in our area. It got really bad so we got on to the ayuntamiento who said town plumber out he dug up our pipes etc and said he had found no significant problem changed a few connections etc but no real difference. II then thought mmmm could it be the pressure reduction valve which I pointed out to the plumber. So he checked pressure before the valve and after and yes that was the issue. He asked me why I had it on as I didn't need it? He said if water pressure was too high just don't open the stop tap fully. I removed the water pressure reducing valve which had in fact simply calked up , I then opened stop tap to give sufficient water pressure to house taps and all has been fine since. In fact even now for the shower we don't have the shower control fully open as it's then like a power shower and would just waste our hot water, we just open it sufficient to give us a good shower without any issues and making our limited hot water last longer.

• Just reading up some more about how to install a restrictor and all the guidelines point to restrictors already being installed in the shower head between the shower head and the hose and it tells you how to install a new one !😮 Therefore, there should already be one installed which points to the fact that our shower head is designed to deliver 14L of water per minute, so we might be better advised to replace the shower head with one that delivers 9.5L water which are the ones they say save water.

I thought about that too and am going to try that tonight and will report back. The only problem I may encounter is that the shower head is at a fixed height and not adjustable down if the flow is restricted. Hubby will be OK, he is at least 6" taller than me 😁 I will let you know how I got on ! May have to turn the temperature down at the valve inside though as that will obviously increase the temperature and it is already set at 45c.

Too things can you not reduce the output using the shower bar control ? It's a tap surely you have one control for heat and one control for output pressure just like a tap? If not then why not just use a simple standard manual shower mixer tap that allows that. I honestly think you have the water temperature for boiler too low so it is not mixing hot with cold water to give desired temperature. That is how one would have it set up for an instant water heater such as a combi boiler in the UK but not for a simple immersion heater with 80 litre tank. It's like orange squash you dilute the squash with water to suit taste more it's diluted longer the bottle of squash lasts

Average. Shower temperature is around high 30s to mid 40s centigrade so you are running your boiler at average temperature to shower ? That would be fine with an instant heating system such as combi boiler but you only have 80 LTRs of hot water. If that hot water is much more than the heat you want to shower at the boiler then the thermostat at tap will introduce cold water possibly doubling the time you can draw hot water. As I say turn the boiler temperature right up to see how that works and adjust shower bar for both heat and pressure to suit both yourself and your husband , that's exactly how we do it my wife is 5ft 7 I am 6ft 2 so we adjust shower head to suit without issue.

We set the boiler to 55c but as I say it is too hot when you first get in but after half a minute it cools down, that is how fast the temperature drops at the boiler😮 To compensate we either have to wait for it to cool down and then you have about 3-3.5 mins to shower before it runs cold, or else reduce the temperature at the valve down to less than 45c which it is set on. Our shower head is at a fixed height so non-adjustable.

Try reducing temperature at shower head and increase it while showering if starts to cool. You are wasting hot water by letting it run too hot until it cools to suitable temperature. I get that you cant adjust shower head height but you must be able to adjust pressure of output. If you are having at high pressure such as you would get with a power shower im afraid 80 ltrs of hot water will not last too long. The hotter the water is in the tank maybe over 55 Deg then the more you can reduce shower temperature by mixing cold which in your case is done automatically with thermostat. You may have to accept slightly lower power from the shower but get longer with hot water. Its probably a compromise such as that or a different system or larger capacity boiler .