We have an unvented system which has one big primary circuit with 3 zone values (DHW, CH and a separate underfloor heating loop).
In an ideal world, I'd like the new towel rail to be gently warm when ANY of the 3 valves are active (lots in winter, just DHW in summer).
Can I therefore tap the towel rail into the primaries before the values, so it gets heated when any of them call for heat?
That would mean tapping off the big 28mm primaries which run up to the 3 values. What's the best way to limit the flow so the towel rail doesn't end up being the shortest loop and taking all flow away before it gets to the values?
If that doesn't make sense I might need to do a diagram!
In an ideal world, I'd like the new towel rail to be gently warm when ANY of the 3 valves are active (lots in winter, just DHW in summer).
Can I therefore tap the towel rail into the primaries before the values, so it gets heated when any of them call for heat?
That would mean tapping off the big 28mm primaries which run up to the 3 values. What's the best way to limit the flow so the towel rail doesn't end up being the shortest loop and taking all flow away before it gets to the values?
If that doesn't make sense I might need to do a diagram!