Solar hot water with a combi boiler
- Thread starter David937
- Start date
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Would you like to explain what function is not going to work with a combi?
Is it not possible to feed the combi boiler with preheated water from the cylinder?
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Yes if the boiler manufacturer permits it.
You need to check if your existing Valliant boiler is designed to take in preheated water.
Some combi's can accept preheated water Vaillant say many of theirs cant so you need to ring the technical department.
You will need either an unvented cylinder or thermal store to use solar in conjunction with a combi boiler.
If your boiler is one that cant accept preheated water you can install either a Combisol valve or a TMV backwards that will send the water if hot enough direct to the taps or through the combi if not.
You will need either an unvented cylinder or thermal store to use solar in conjunction with a combi boiler.
If your boiler is one that cant accept preheated water you can install either a Combisol valve or a TMV backwards that will send the water if hot enough direct to the taps or through the combi if not.
Unfortunately your Vaillant will not accept pre-heated water.
As said, some makes can, other makes can also do this with a special adaptor.
Personally, if I was ever thinking of the solar route in the future, I would not contemplate a combi.
Apart from anything else, most people have combi's fitted because they either want to gain space, or they haven't the space for a HW cylinder.
So why would they have a combi and HW cylinder?
Solar is over rated, over hyped and will never be cost effective until the government gives at least 50% grants towards its installation.
But then that would mean they have to spend some of the indirect taxation they receive from the so called 'green taxes'.
As these taxes are just another source of income and nothing at all to do with being green, they will never spend them on what they appeared to be intended for
As said, some makes can, other makes can also do this with a special adaptor.
Personally, if I was ever thinking of the solar route in the future, I would not contemplate a combi.
Apart from anything else, most people have combi's fitted because they either want to gain space, or they haven't the space for a HW cylinder.
So why would they have a combi and HW cylinder?
Solar is over rated, over hyped and will never be cost effective until the government gives at least 50% grants towards its installation.
But then that would mean they have to spend some of the indirect taxation they receive from the so called 'green taxes'.
As these taxes are just another source of income and nothing at all to do with being green, they will never spend them on what they appeared to be intended for
You will need extra space if you want to add solar in the future.
If you wanted to add solar you would have been better fitting a solar ready cylinder and a heat only boiler.
Tony
D
Deleted member 105431
Solar is expensive to install and you are unlikely to get a return over the medium to long term.
I wouldn't bother with it just yet untill it has improved and costs have fallen.
I wouldn't bother with it just yet untill it has improved and costs have fallen.
B
breezer
I have often wondered what you are supposed to do when the radiator in a box on your roof freezes and splits.
Since its on the roof you will need scaffold to safely get up there.
unless they have a frost stat and auto drain feature?
Since its on the roof you will need scaffold to safely get up there.
unless they have a frost stat and auto drain feature?
D
Deleted member 105431
they are full of antifreeze similar to engine coolant systems so unlikely to freeze. . . . . .
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