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I think its a 30C which says it is a combi boiler on their website. What kind of boiler would it be if it wasn't a combi?
 
Okay that is a combi boiler however it sounds like it’s been adapted to heat the hot water cylinder in the loft. We can work out what it feeds fairly simply. There should be five main copper pipes coming down from the bottom of the boiler from left to right it should be Flow, hot water, gas, cold water, return. I noticed from one of your pictures that the hot water pipe may well be capped off is that the case.
 
The simple answer is you need the boiler as this provides the heat source for the Stelflow to heat your hot water
 
ok - and we can't move the Stelflow and other thing from the loft downstairs as it needs to be near the shower in the loft?
 
No I never said it couldn’t be moved just based on the install you will need the boiler cylinder and booster Still so I would suggest it would be prohibitively expensive unless you are planning other works. Only you know what you can afford though
 
Ok thanks Riley - so we could move the stuff from the loft down to the kitchen and it would do the same job?
 
do we need the combi boiler in the kitchen, or can we just get a water heater for the hot water cylinder?
 
do we need the combi boiler in the kitchen, or can we just get a water heater for the hot water cylinder?
The boiler will be heating your radiators and hit water. What will provide heat if you get rid of it!

I think you are confusing yourself
 
So is it theoretically possible just to move the kit from the loft down to the kitchen next to the combi boiler? (this is moving the stelflow and pump - not sure why we need the hot water cylinder). It just seems an awful lot of gear for a house with two showers. My parents have a larger house with more bathrooms and radiators and i think they just have a megaflow in a utility room somewhere?
 
So is it theoretically possible just to move the kit from the loft down to the kitchen next to the combi boiler? (this is moving the stelflow and pump - not sure why we need the hot water cylinder). It just seems an awful lot of gear for a house with two showers. My parents have a larger house with more bathrooms and radiators and i think they just have a megaflow in a utility room somewhere?
You would need a big cupboard to put it in.
Your parents might not have poor incoming pressure and flow
 

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