For engineers & contractors
Design & estimating tools Steam & hydronics, in one place
Manufacturer sizing and selection tools for the lines we represent, plus steam and hydronic engineering references and code pointers. Need a selection? Send us the load and the application details.
Note: Tools are provided for convenience; final selection should be confirmed with MRS.
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Manufacturer sizing & selection
Official tools from lines on the MRS line card. For steam boiler selections (Johnston, Unilux, Victory Energy) and engineered packages, send us the load for a selection.
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A. O. Smith
Commercial water heater sizing (Pro-Size) plus published sizing diagrams by building type.
- Commercial water heater sizinghotwater.com
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American Wheatley
Hydronic expansion tank sizing and product selection guides.
- Expansion tank calculatoramericanwheatley.com
- Product guidesamericanwheatley.com
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Diversified Heat Transfer (DHT)
Sizing charts for SP Series instantaneous water heaters and double-wall brazed plate heat exchangers.
- SP Series water heater sizing chartsdhtnet.com
- Double-wall brazed plate quick-sizing (PDF)dhtnet.com
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DP Pumps
DP-Select for DPV / DPHM multistage pumps and booster sets: select by flow and head, or cross over an existing pump.
- DP Pumps selectordppumps-usa.com
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Enervex
Chimney fan selector for sizing a chimney fan from the fireplace and flue details.
- Chimney fan selectorenervex.com
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Flamco
FlexCalc sizing for expansion vessels and pressurization units.
- FlexCalc vessel sizingapps.flamcogroup.com
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Johnston Boiler
Boiler formulas (boiler horsepower, factor of evaporation, blowdown, cycles of concentration) and product knowledge.
- Boiler formulasjohnstonboiler.com
- Product knowledge basejohnstonboiler.com
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MIFAB
Grease interceptor sizing and the interceptor selection guide.
- Size My Interceptorsizemyinterceptor.com
- Interceptor selection guide (PDF)mifab.com
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Riello
North American burner and commercial condensing boiler lines, with firing-rate and technical data.
- Burners (North America)riello.com
- Commercial boilers (North America)riello.com
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Thermal Care
Process chiller calculators.
- Machine tool chiller selection calculatorthermalcare.com
- TC central chiller energy calculatorthermalcare.com
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WILO
Wilo USA pump selection software for pumps and booster systems (free sign-in).
- Wilo pump selection softwarewilo.com
02
Steam & hydronic references
Quick references for steam tables, pipe sizing, condensate and trap loads, venting, and water treatment.
Steam tables & properties
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Steam & water properties
Saturated and superheated steam properties.
- NIST Chemistry WebBook: fluid propertieswebbook.nist.gov
- Saturated steam table (imperial)engineeringtoolbox.com
Pipe sizing
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Steam piping
Schedule 40 steam flow vs. pressure drop, with pressure correction factors.
- Steam flow vs. pressure drop, Sch 40engineeringtoolbox.com
- Steam pipe pressure-drop correctionengineeringtoolbox.com
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Hydronic piping
Water flow, velocity, and friction loss in Schedule 40 steel pipe.
- Sch 40 steel pipe pressure lossengineeringtoolbox.com
- Steel pipe maximum flow capacitiesengineeringtoolbox.com
Condensate & trap sizing
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Condensate loads
Warm-up and running condensate loads for steam mains, used to size traps.
- Warm-up condensate in cold steam pipesengineeringtoolbox.com
- Running condensate, insulated steam pipesengineeringtoolbox.com
Venting & stacks
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Chimneys & vents
Venting code references and chimney fan sizing.
- NFPA 211: chimneys, fireplaces, ventsnfpa.org
- NFPA 54: National Fuel Gas Code (venting)nfpa.org
- Enervex chimney fan selectorenervex.com
Water treatment & steam system basics
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Boiler water & blowdown
U.S. Department of Energy guidance on blowdown and steam boiler best practices.
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Steam system assessment
Free U.S. DOE software and reference material for steam systems.
- MEASUR (online tool suite)measur.ornl.gov
- About MEASURenergy.gov
- Improving Steam System Performance: A Sourcebook (PDF)energy.gov
- DOE steam systems resourcesenergy.gov
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Codes & standards
Official pages for the codes that govern boiler rooms in our territory. Always confirm the edition adopted by the authority having jurisdiction.
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ASME
Boiler & Pressure Vessel Code and CSD-1 controls and safety devices.
- ASME BPVCasme.org
- ASME CSD-1asme.org
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NFPA
Boiler and combustion systems hazards, fuel gas, and venting.
- NFPA 85: Boiler & Combustion Systems Hazards Codenfpa.org
- NFPA 54: National Fuel Gas Codenfpa.org
- NFPA 211nfpa.org
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New York State
Current NYS Uniform Code books and boiler inspection authority.
- 2025 Mechanical Code of New York Statecodes.iccsafe.org
- 2025 Fuel Gas Code of New York Statecodes.iccsafe.org
- NYS DOS Building Standards & Codesdos.ny.gov
- NYS DOL Boiler Safety Bureaudol.ny.gov
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Pennsylvania & Ohio
State boiler and pressure vessel programs.
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National Board
Boiler and pressure vessel inspection, NBIC, and repair resources.
- National Board of Boiler & Pressure Vessel Inspectorsnationalboard.org
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MRS resources
Everything on this hub for your next budget, bid, or replacement.
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Quotes & evaluations
Send specs, schedules, or nameplate photos. Free BOD / named-equals evaluation.
- Request a quote / free evaluationrfq.mrs-upstate.com/rfq/
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Line card
Every line MRS represents in Upstate NY, with cutsheets, cross-reference, and submittal builder.
- MRS line cardrfq.mrs-upstate.com/linecard/
- Browse & build a requestrfq.mrs-upstate.com/catalog/
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Bid calendar
Upcoming public bids where MRS equipment applies.
- Bid calendarrfq.mrs-upstate.com/bid-calendar/
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Equipment room layout
Alternate / fit drawings and MRS Field Layout intake.
- Equipment room layoutrfq.mrs-upstate.com/layout/
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Lunch & Learn
Book a session for your team, in person or on Microsoft Teams.
- Book a Lunch & Learnrfq.mrs-upstate.com/lunch-and-learn/
Tools are provided for convenience; final selection should be confirmed with MRS.