I posted this question a few weeks ago, but no one else replied.
I have bought an old cottage in France, where I will live in 2 years. I am renovating it.
I want to install a wood burner in sitting room with a back boiler. Upstairs there will be a copper water cylinder connected to the wood burner's b. boiler.
In the summer I will heat the water in the cylinder with an immersion element, which is easy to control the water temp. with.
In the winter when the fire is lit, the cylinder will be heated from the wood burner.
My question is, how do I control the water temp. in the cylinder when it is being heated by the back boiler? Do people control the water temp on cylinders heated by wood burners, I'm worried that without control, the water temp. will be too hot coming out of the taps.
you dont controll the water temp unless you get a stove with a water stat even then the "system" has to absord the heat out put when the stove idols.
Just make sure the stove has a low output boiler in it for water heating only, some are glass lined for direct systems.
Of course you should be consulting french regs (if the exist)!
Ok Cider thanks, will try to get a boiler with a water stat. I really want to buy the equipment in The UK to take with me. Do you know of a good supplier or manufacturer?
im not telling you to get a stove with a water stat.
The stove output to room has to match the room, and if it can have a boiler fitted, that has to have an output to match the demand .
Dont buy the one that looks right for the opening!
Find your local stove supplier, they should give the advice you need face to face
This is completely outside my experience, so please forgive me if this is a silly idea.
It seems to me that the important thing is the dhw temperature to the taps - the water in the cylinder can be much hotter, as long as it doesn't boil.
Could you not install a thermostatic mixing valve on the dhw flow from the cylinder, the cold side of which would be fed directly from the cold water cistern?
In my experience a Cyltrol valve will give you a degree of control over the domestic hot water temp, though a 'heat-sink' radiator would need to be incorporated into the primary pipe loop as well, ie a radiator that cannot be turned off. This radiator will then take the heat that would have gone to the cylinder before the cyltrol closed and help keep the back boiler from getting too hot and err boiling. It is usual practice to have this radiator in the bathroom to act as a towel warmer, then the heat is not completley wasted.
But, as has already been said, check local regs first.
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