Is there a max INPUT temp for a combi?

[MrBland]

Slightly theoretical question. Am thinking that you could use a secondary source e.g. wood burner stove or solar cells to heat a tank of water. If this was pressurised with a balance tank rather than vented this could then be the feed straight to a combi. Thus hot water all the time at the correct temperature but reduced running costs.
But would the combi have e.g. some safety device against this?

Any thoughts appreciated.....

[ianmunt]

check with your boiler manufacturer,preheating with solar panels is certainly OK with some models

[gucciman]

most of the big boiler makers are pushing solar heating really hard at the moment, went on a course at vaillant recently and they were quoting 6000 for a solar panel and hot water tank with installation.