3 level 4 bedroom house. megaflow in the loft. Only two Radiators in whole house has TRV's. One right at the top close to megaflow and one right at the bottom furtherest away. The rest of the rads have normal locksheilds on. The two radiators on the ground floor in an open plan kitchen come conservatory area don't heat up evenly. If you turn the rads on the second floor off the become piping hot. These two rads are parallel to each other in situ. What would the problem be. Tried to balance the system. How do I balance a system please? Any other advise maybe something I`m over looking. Will it make a difference if all the rads had TRV's on them.