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High Mass

COMMERCIAL BOILERS. High Mass. Medium Mass. Low Mass. 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

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High Mass

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  1. COMMERCIAL BOILERS High Mass Medium Mass Low Mass

  2. 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

  3. 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

  4. 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

  5. MEDIUM MASS FIRETUBE Advantages • 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

  6. 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

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