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tfc715 tfc715 is offline
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Default Complicated central Heating; Back-Boiler and Combi-Boiler

Hi,
I’m new here.
I’ve recently bought a house in Scotland as a holiday home.
At the present heating and hot water run of two back-boilers which are heated by open fires. (In two separate rooms)
There is a twin coil hot water tank in the drying room with gravity circulation. (I believe)
The central heating (9 radiators) is circulated by one pump. Both back boilers feed the central heating.
Can someone make an educated guess at how the water flow through the radiator has been designed?
Will it be kind of one circle with the water being pumped around and around?
If I remember rightly, the Radiator can be adjusted separately, so there must be some form of a bypass or something.

Sorry I can’t give more precise information, but I live in Germany, and can’t investigate into the system myself at the moment.

In May, I want to include a combination boiler into the system. Either gas or oil, I haven’t decided on that point yet (no mains gas).
How do I best go about it?

I believe that I can get rid of the hot water tank under the roof, since Water will come directly from the new combi-boiler
Is it Ok to blank the gravity feed and return pipes from the boiler in the attic, or do I need to open the fireplace and blank the ends at the boiler? Or should I just short-circuit the pipes in the attic?

I would very much like to keep the back-boilers operational for heating purposes.
Is that possible?
I assume that the heating will be run of the combi-boiler a lot of the time. But when I light a fire I would like to have the feeling that I’m not wasting a lot of energy. So if it is possible I would like to have the back-boilers included into the system.
When the combi-boiler is heating the house, depending on the way the central heating piping has been designed; the back-boilers would act as a radiator warming the air in the fireplace and causing a drought up the chimney. ???
Would it be feasible to install a "Bypass" ??
I’m thinking of a 3 - way valve which sits in front of the water flow to the back-boiler.
In one position the water flows through the back-boiler and gets heated by the fire
In the other position the water flows through the bypass and doesn’t heat the back-boiler unnecessarily.

Or am I construction a Bomb?

I’d be very pleased for any kind of feedback.
regards
Erech