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Thank you Aragorn84. It hadn't occurred to me to do that but now I see that's the obvious thing to do, after all it's just a big kettle isn't it. I have some time this weekend so will give it a try.

A quick visual check inside the unit doesn't show anything odd. I've put photos in album "Horstmann". Unit has power coming in as the timer works ok (both for Boost and Econ 7) and I do get hot water on Econ 7, but not on Boost. It could be something to do with the power to the Immersion...

Economy 7 Controller

Yes. Also, sorry I should have said I changed the thermostats around (not the elements) to check that it wasn't a thermostat problem. That didn't make any difference so I then had the tank drained and the top element replaced. It cost £200 as it took an hour to drain the tank (elements go in...

It only has a 1 hour Boost option. It's one of the old style Horstmann units. I'll take a look inside and see if I can see anything obvious. I've already spent £200 getting the tank drained and element changed so want to identify exactly what's wrong if I can before getting someone in to...

Yes, it has been changed for a new element and I've swapped top and bottom elements around.

Hello, I have an immersion heater with a Horstmann Economy 7 controller. The immersion tank has 2 elements. The Economy 7 function works ok (bottom element). When I try to use the 1 hour Boost function (top element), the boost light on the Horstmann flickers on briefly but then goes out...