... .Be used with pressure up to 6Bar/87Psi; Solar collector model:This model is pressurized, with TU1 copper heat pipe and with ... high efficiency.Solar energy collector:This model is pressurized, with TU1 copper heat pipe and with high ... , industrial and commercial heating use2) Suitable for open or closed Loop (anti-freezing liquid )3) Caravan Parks, Hotels, Schools, Public Showers ...