Serene, Heater, models:

Optima S2055	Installation And Operating Manual
S2033	Operating & Installation Manual
S2044	Instruction And Operation Manual
S2044 ROMA	Installation And Operating Manual
S2059	Specifications - Operating Instructions
S2066	Operating Instructions
S2067	Operating Instructions
S2068	Operating Instructions
S2077	Installation And Operating Manual
S2088	Operating Instructions
S2212	Operating & Installation Manual
S6069 Apollo	Operation Manual
Sirio S2028	Operating & Installation Manual