High Mass

Medium Mass

Low Mass

COMMERCIAL BOILERS

HIGH MASS Advantages• Flow Indifferent• Primary Piping• Resistant to low return temperature issues• Up to 1200 H.P.• 20 plus year life expectancy

Disadvantages • Least efficient • Higher cost per BTU output• Big Footprint• Thermal shock

LOW MASS CFT

Advantages• Lowest cost per BTU output• Small footprint

Disadvantages

• Flow dependent• Short cycles• Vulnerable to condensate• Required primary secondary piping• Up to 15 years of life

LOW MASS FIRE TUBE

Advantages• Small Footprint• Higher Efficiencies

Disadvantages • Flow dependent• Requires high turndown ratio• Primary secondary piping• 316L• Up to 10 year life

MEDIUM MASS FIRETUBEAdvantages

• Flow independent• Primary Piping• Tolerant to low return temps• 20 plus year life• Small footprint• Resists thermal shock• Available in condensing & Non-Condensing• No short cycling• 5:1 turndown adequate

Disadvantages• More expensive than low mass

SUPPLY/RETURN SYSTEM• 2 Way vs. 3 way valves• Bypass

Minimum Flow Rate• High Mass• Low Mass• Medium Mass

Type of Pipe

• Steel• Copper• PP-R