What 'whole-house hydronic' actually means
Every heated space in the home is served by hot water from a central boiler. No forced-air furnace, no ductwork (for heat). Heat is delivered through:
- Radiant floor heating (in-floor PEX) — most common in new Utah builds
- Panel radiators (low-profile wall-mounted) — common in renovations
- Baseboard radiators (older approach) — less common in new construction
- Hydronic air handlers (heat exchanger + blower, for spaces where radiant isn't practical)
Most full hydronic systems use radiant for main living areas and a hybrid approach in less-frequented spaces.
What it costs
For a typical Utah custom home (3,500 sq ft):
- New construction, mostly radiant slab on grade: $32,000-$48,000
- New construction, fully hydronic with multiple methods: $45,000-$68,000
- Retrofit of fully forced-air home: $58,000-$95,000
Includes tubing, manifolds, controls, but NOT the boiler. Whole-house hydronic typically needs a 120,000-200,000 BTU mod-con boiler — add $11,500-$15,500 installed.
Total whole-house investment for a custom Utah home: typically $45,000-$95,000 (new construction) or $70,000-$110,000 (retrofit).
When it's the obvious move
Strong case:
- New construction. Cost differential is smallest at the new-build stage. PEX in the slab while pouring is cheap; adding it later is expensive.
- Custom or premium home. Comfort is a feature you market, not an afterthought.
- Park City, Wasatch Back, Heber. Long heating season + cold winters = radiant ROI improves vs forced air.
- Allergies or asthma in the household. No air movement = much fewer airborne allergens.
- Open floor plan. Radiant heats evenly across open spaces; forced air struggles with stratification.
- You're planning to live there 15+ years. Long-term comfort + operating savings + reliability win.
Weaker case (consider hybrid or forced air):
- Budget renovation
- Vacation home with significant on/off cycling
- Existing forced-air system in good condition (retrofit is expensive)
- You need AC (forced air can do both — radiant only heats)
The hybrid approach (often best)
Most Utah custom homes we work on don't go 100% radiant. The typical hybrid:
- Radiant floor: main living areas, master bath, basement, garage
- Panel radiators: bedrooms, less-frequented rooms
- Hydronic air handler: if AC is wanted, a single hydronic air handler + AC condenser provides cooling and supplemental fast-response heat
This costs 20-30% less than fully-radiant approach while delivering 90% of the comfort benefit.
System longevity
One of hydronic's big advantages:
- PEX tubing: 50+ years (rated for that lifetime, embedded in slab or behind walls)
- Manifolds: 25-40 years
- Boiler: 15-25 years (gets replaced periodically; the rest of the system stays)
- Pumps and controls: 12-20 years
The boiler is the constraint. Plan to replace it every 15-20 years. Everything else outlasts the boiler and stays for the next.