[Not much hot water from the calorifier...]

Hi All, thanks so much for all the replies - I had made a massive balls-up and connected the coolant into the main water part of the tank...(luckily just a few litres).After MUCH flushing out and refilling I've got piping hot water! Thanks for all your help!

[Not much hot water from the calorifier...]

1 minute ago, Ex Brummie said:

Just because it was fitted horizontal in another boat does not mean it is a horizontal cylinder.

Pictures will tell us a lot. I've seen many vertical cylinders fitted horizontal and they will work reasonably if the cylinder is fed through the normal outlet at the top, and the flow out is from the normal feed at the bottom, as long as the outlet is at the high point of the installation.

Sorry yes I should post pictures, just need to search how to do so. I think it's horizontal as it has attachments for 2 different coils at different ends I.e it couldn't 'stand ' .

2 minutes ago, Tony Brooks said:

But if you only heat a coil full once that water has been drawn off you are relying on heat transfer through the pipe into the flowing water and I suspect it won't be that great. may get luke warm but the OP might be taking that as cold.I bet a thermal store has something more that a plain pipe to transfer the heat into the hoy water - possibly finned, plates or a very long "coil".

I flushed each coil when I got it, to work out each 'set ' so I'm pretty sure I've got them right, also, I'd have 55l of coolant in there and the system for the heating is primed up with around 56l and working great.

[Not much hot water from the calorifier...]

I think it's seated the correct way up - it's got a sort of flat bottom on the insulation foam from its previous fitting on another boat..I'm trying the cold and hot pipes switched over as I've got no manual or diagrams that came with it (Second hand, not a surecal) and see if that somehow makes a difference...

[Not much hot water from the calorifier...]

17 minutes ago, Alan de Enfield said:

Some cauliflowers are built to be used 'lying down' (horizontal) and some 'standing up' (vertical) have you installed the one you have in the correct orientation ?

Yep its definitely a horizontal. 

[Not much hot water from the calorifier...]

Ah ok..these all make sense...I'm assuming I'd have to actually disconnect pipes and rotate whole calorifier in order to get the pipework running correctly I its interior, or is it just a matter of switching the feeds?

[Not much hot water from the calorifier...]

Hi, i'm new to the forum, fitting out my own boat currently! My horizontal calorifier is fitted and fed by a webasto and the engine take off hoses for heat, twin coil, and  connected to accumulator and expansion tank just after the hot water out pipe from the calorifier. 

I only get 2 litres or so of hot water before it becomes cold, checked and bled the coolant side of the circuit, all fine, adjusted the thermostatic mixer valve to make sure it's not all cold mixing in. 

Water does come through from the hot tank, just a very small amount, so unlikely to be a blockage as water is flowing from the tank...im at a loss, any ideas??