Downtown Logan Historic Home Boiler Replacement — Cache County Courthouse Area, October 2024
This case study documents a planned boiler replacement project for a 1908 downtown Logan historic home approximately three blocks from the Cache County Courthouse on a north-south side street. The home retains its original cast iron radiator hydronic heating distribution system; the boiler had been replaced once previously in 1992 with a mid-efficiency atmospheric-vent unit that was now approaching catastrophic failure. The homeowners (long-term residents who deeply value the home’s heritage character) requested a quote in early September for shoulder-season replacement before the heating season began.
Initial Concern
Homeowner call: “Our boiler is making strange noises and we’ve had two service visits this past winter. The contractor said it was probably the last winter we’d get out of it. We want to plan replacement before it dies completely. We absolutely want to keep our radiators — please tell us that’s possible.” The homeowners had researched the topic substantially and arrived at the consultation well-informed about their options; they understood the difference between boiler-only replacement (retaining the radiator distribution system) and complete heating system replacement (boiler + ductwork installation + radiator removal).
Property Context
- Home: 2,200 sq ft 2-story brick historic home, 1908 construction
- Heating distribution: Original cast iron column radiators throughout, 11 radiators total ranging from 12-section units (smallest, secondary bedrooms) to 24-section units (largest, primary living areas); original 2-pipe steel piping with appropriate sizing and condition
- Existing equipment: Weil-McLain CGa-5 cast iron sectional boiler, 1992 installation, 110 kBTU input, 82% AFUE, atmospheric venting through original chimney; equipment was 32 years old and showing substantial mineral scaling, sectional gasket deterioration, and operational unreliability
- Boiler location: Basement utility area; substantial working clearances; clean access
- Domestic hot water: Separate gas water heater (no integration with boiler)
- Fuel: Natural gas (Dominion Energy service)
- Existing chimney: Brick chimney in good structural condition; documentation existing for chimney lining condition
Site Assessment and Design Process
- Initial consultation: September 8, 2024 (2 hours on-site)
- Heat loss verification: Manual J calculation for the home produced design heat loss of 78,500 BTUH at 3°F Logan design conditions; equipment sizing required 85–95 kBTU input depending on equipment efficiency
- Radiator capacity verification: Total radiator EDR (equivalent direct radiation) verified at adequate for the home’s heat loss with reasonable operating water temperature (170°F supply, 30°F differential)
- Piping inspection: Original 2-pipe steel piping inspected throughout accessible portions; condition appropriate for continued use with no replacement needed beyond near-boiler piping modifications
- Venting analysis: Existing chimney venting compatible with mid-efficiency boiler replacement; sealed-combustion sidewall PVC venting required for high-efficiency condensing replacement; homeowners preferred sidewall venting for combustion safety improvement
- Equipment selection consultation: Multiple visit discussions covering equipment options (mid-efficiency 82% AFUE atmospheric replacement at lowest cost; high-efficiency 95% AFUE condensing replacement at higher cost but substantial efficiency improvement; modulating condensing equipment with variable-capacity at highest cost but best comfort and efficiency)
- Equipment selection: Weil-McLain Ultra Series 4 high-efficiency condensing boiler with modulating operation (15–90 kBTU input range with continuous modulation), 95% AFUE, sealed combustion sidewall venting
Installation Scope
- Old boiler removal: Disconnect of gas service, electrical service, piping connections, venting; physical removal of cast iron sectional boiler (substantial weight requiring careful handling)
- Sidewall venting installation: PVC venting routed from new boiler location to north-facing exterior wall termination; combustion air intake parallel routing; appropriate clearances from building features per code
- Old chimney connection capping: Cleanup at old chimney connection point with appropriate cap and seal; chimney remained intact for fireplace function unchanged
- Near-boiler piping modifications: New piping configuration optimized for condensing boiler operation (low-temperature return for proper condensing); circulator pump replacement matched to new boiler specifications; new pressure relief valve, expansion tank, fill valve, and air separator per current code
- Boiler placement and connection: New boiler positioned in existing utility area; gas piping connection with new shutoff valve, union, and pressure testing per code; electrical service connection; condensate drainage installation routing to building drainage; venting connection
- Outdoor reset control installation: Modulating boiler operation with outdoor temperature sensor for optimum supply water temperature based on outdoor conditions; substantial efficiency benefit and improved radiator system comfort
- System fill and bleed: System drain, refill with appropriate water treatment, bleeding of all radiators and high points
- Commissioning: Combustion analysis verifying safe operation, modulation testing across capacity range, outdoor reset configuration verification, radiator distribution verification with temperature measurement at each radiator
- Permit inspection: Logan City Building Inspection scheduled and completed; combustion safety verified; venting installation approved; gas piping pressure testing documented
Cost and Documentation
- Equipment cost: $4,850 (Weil-McLain Ultra Series 4 with outdoor reset control)
- Installation labor and materials: $7,985 (substantial work including sidewall venting, piping modifications, condensate drainage, electrical service, removal of old equipment)
- Logan City permit: $285
- Disposal of old boiler: $385 (specialty disposal for cast iron sectional equipment)
- Sales tax: $980 (calculated on equipment and taxable materials)
- Total project cost: $14,485
- Payment: Homeowner financing through home equity line; payment timing flexible to accommodate installation schedule
- Documentation: Detailed project documentation including equipment specifications, warranty registration, installation photos, commissioning data, permit inspection records
Timeline
- Initial consultation: September 8, 2024
- Detailed proposal delivered: September 12, 2024
- Homeowner authorization: September 16, 2024
- Equipment order and delivery: September 16 to September 25, 2024
- Logan City permit application: September 25, 2024
- Permit approval: September 27, 2024
- Installation work: October 2–3, 2024 (2 days; substantial scope warranting more than single-day installation)
- Permit inspection: October 7, 2024 (approved without comment)
- Total project duration: 4 weeks from initial consultation to final inspection completion
Outcome
- System operating reliably through 2024–2025 winter without service calls
- Efficiency improvement: Estimated 18% gas consumption reduction vs. previous equipment based on first-winter operation tracking; substantial financial benefit on $1,650 annual gas heating cost
- Comfort improvement: Outdoor reset modulation provides more consistent radiator surface temperature; less cycling; better humidity in heated spaces; homeowner satisfaction high through first heating season
- Combustion safety: Sealed combustion eliminates atmospheric venting concerns; particularly relevant during PCAPS inversions when atmospheric venting can produce safety issues
- Heritage character preserved: Original cast iron radiators continue serving as the heating distribution system; no visible installation changes to the home’s living spaces
- Warranty coverage: 10-year manufacturer parts warranty registered; Weil-McLain heat exchanger warranty includes coverage for sectional/cast iron components
- Follow-up: Spring 2025 system maintenance visit verified continued proper operation; homeowner enrolled in Comfort Club for ongoing maintenance
Reflection on This Case
This project illustrates the appropriate approach for historic Logan homes with original radiator heating systems: the cast iron radiator distribution system is genuinely worth preserving (the radiators are durable equipment with effective heat distribution characteristics; they’re part of the home’s heritage character; replacement with ductwork would be substantially more invasive and expensive); boiler-only replacement provides modern efficiency, safety, and warranty benefits without compromising the existing system; outdoor reset modulating operation is genuinely better matched to radiator heating than fixed-output boiler operation; the shoulder-season scheduling allowed thorough work without time pressure. The total cost ($14,485) is substantial but appropriate for the scope and the long service life expected from properly-installed condensing boiler (18–22 year typical service life); the alternative of continued repair of the 32-year-old equipment would have produced ongoing cost and reliability concerns leading to inevitable replacement anyway. For other Logan homeowners with historic homes and original radiator systems, this case study illustrates the practical scope and cost of comparable boiler replacement projects.
Related Services and Resources
- Boiler installation service
- Boiler repair service
- Logan general HVAC service
- Logan furnace installation
- Comfort Club maintenance plans
- All case studies
Contact Velox Heating and Air
- Phone (24/7): (385) 250-2653
- Address: 2427 N Main St, Logan, UT 84341
- Email: info@veloxheatingandair.xyz
- Utah DOPL HVAC Contractor License: #10234567-5501
- EPA Section 608 Universal: #608U-2011-385729
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