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Boiler Services High-Efficiency Combi Boilers

Two Systems. One Compact Unit.

Combi boiler installation across the Capital Region. Home heating and on-demand hot water in a single wall-hung high-efficiency unit that frees up significant basement space. The modern upgrade for historic homes and efficiency-focused homeowners.

Get A Combi Installation Quote Call 844-MY-JOCKEY
Licensed & Insured NY
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Flat-Rate Pricing
Combi By The Numbers
What A Modern Combi Delivers
92-96%
AFUE Efficiency
2-in-1
Heat + Hot Water
Wall-Hung
Compact Footprint
On-Demand
Endless Hot Water
What A Combi Boiler Is

The Modern Boiler For Modern Homes

A single wall-hung unit that handles both home heating and household hot water. Smaller footprint, higher efficiency, simpler maintenance.

A combi boiler is a single piece of equipment that delivers two services: it heats your home through your existing radiators or baseboards, and it produces domestic hot water on demand for showers, sinks, and laundry. Most combi units mount on the wall and take up a fraction of the space of a traditional boiler plus standalone water heater setup. Modern combi boilers run 92-96% AFUE efficiency, putting them at the top of the residential heating equipment available today.

For Capital Region homeowners, combi installations especially make sense in older homes where basement space is tight. The historic neighborhoods across Saratoga Springs, Troy, Cohoes, Mechanicville, and Rensselaer often have cramped mechanical rooms where pulling out a 50-gallon water heater and a standard boiler and replacing both with a single wall-hung unit frees up real square footage. That basement space converts into storage, workshop area, or finished living space.

Combi boilers are not the right answer for every home. Households with multiple simultaneous high-flow demands (three showers running at once, for example) sometimes do better with a traditional boiler and a separate water heater. The combi-vs-traditional comparison on this page lays out the honest tradeoffs. If a combi isn't the right fit, the standard boiler installation or boiler replacement options are the alternative. See the full boiler service overview for everything we cover.

How A Combi Boiler Works

One Unit, Two Jobs

The combi handles two completely separate water systems through one shared heat source. Here's the simplified flow.

Closed Loop

Home Heating

Water circulates through a sealed loop between the combi and your existing radiators or baseboards. Same hydronic heat delivery as a traditional boiler, just from a more compact unit.

Combi Unit
On-Demand

Domestic Hot Water

When you open a hot water tap, fresh cold water flows through a heat exchanger inside the combi, gets heated instantly, and comes out hot at the fixture. No tank, no standby losses, no waiting.

The clever part: Both water systems share one combustion unit, but the heating loop water and your tap water never mix. The combi heats your tap water through a heat exchanger the same way an espresso machine works — pass cold water past a hot surface, get hot water out the other end. Domestic hot water gets priority, so when someone turns on a shower, the combi briefly pauses heating to deliver the hot water, then resumes. You don't notice the swap.
The Space Math

Get Your Basement Back

A traditional boiler plus standalone water heater can take up a closet-sized area of your basement. A wall-hung combi takes up roughly the same footprint as a kitchen cabinet.

Traditional Setup

Boiler + Tank Water Heater

20-30 sq ft
Typical Floor Footprint
  • Floor-mounted boiler cabinet
  • 40-50 gallon water heater
  • Two separate venting runs
  • Two annual maintenance schedules
Combi Setup

Wall-Hung Combi Boiler

2-4 sq ft
Wall Footprint Only
  • Mounts on the wall, off the floor
  • No water heater needed
  • Single PVC venting run
  • One unit, one maintenance schedule
Head To Head

Combi vs Traditional Setup

The honest comparison. Combi wins on some criteria, traditional wins on others. Knowing where each excels is how you make the right call for your home.

Criterion
Option A
Traditional Setup
Option B
Combi Boiler
Floor Space
20-30 sq ft of floor space
Wall-mounted, frees up floor
Efficiency (AFUE)
80-95% boiler, plus separate water heater losses
92-96% combined, no standby losses
Hot Water Supply
Tank capacity (40-50 gal), then refill wait
Endless on-demand, no tank to run out
Simultaneous Flow
Tank handles multiple simultaneous uses easily
Limited by flow rate (sized to home)
Equipment Count
Two units (boiler + water heater)
One unit, one maintenance schedule
Upfront Cost
Lower upfront, especially boiler-only swaps
Higher upfront, but eliminates the water heater
Long-Term Operating Cost
Two units to replace separately over time
One unit, lower lifetime fuel costs
The Honest Fit Check

Is A Combi Right For Your Home?

Combi boilers are excellent for the right home and the wrong call for others. Here's how to know which side you're on.

Strong Combi Fit

A Combi Is Likely The Right Call If

If most of these apply to your home, a combi boiler installation is usually a smart upgrade.

  • 1-2 bathroom home with typical hot water demand
  • Aging boiler and water heater both nearing replacement
  • Tight basement or mechanical room
  • Historic Capital Region home with original-era layout
  • You want maximum efficiency on monthly fuel costs
  • Natural gas service available at the property
Worth A Closer Look

A Traditional Setup May Be Better If

If most of these apply, sticking with a traditional boiler plus water heater might serve you better.

  • 3+ bathrooms with regular simultaneous use
  • Large household with high peak hot water demand
  • Boiler is end-of-life but water heater is newer
  • You want the lowest upfront install cost
  • Heating with oil and not switching fuel
  • Existing infrastructure works against combi venting
Why Homeowners Trust Us On Combi Installs

Combi Installs Done Properly

Combi boilers are technically demanding to install correctly. The right setup determines whether you get the efficiency the manufacturer promised or constant problems.

Proper Sizing

Combi sizing is about flow rate, not just BTU. We match the unit to your fixture count and demand pattern.

Flat-Rate Pricing

Quote is the price. Includes combi unit, water heater removal, new venting, and full system commissioning.

Honest Fit Check

If a combi isn't the right call for your home, we tell you. You won't get talked into a setup that doesn't suit your demand.

All Major Brands

We install Navien, Rinnai, Lochinvar, Weil-McLain, Bosch, and other major combi lines. Recommendation depends on your home.

FAQ

Combi Boiler Questions

The questions homeowners ask most when researching a combi installation.

They're related but not the same thing. A tankless water heater produces on-demand hot water for fixtures, but it doesn't heat your home. A combi boiler does both: it heats your home through your radiators or baseboards AND produces on-demand domestic hot water for taps and showers. If your home uses forced-air heating (a furnace), you'd want a tankless water heater. If your home uses hydronic heating (a boiler), a combi gives you everything in one unit.
Depends on the size of the combi installed and your home's plumbing. A properly sized residential combi for a 2-3 bathroom home typically handles two simultaneous moderate-flow uses (a shower plus a kitchen sink, or two showers if they're both low-flow). Three full-flow showers running at the same time exceeds what a typical combi delivers and would be a sign that a traditional boiler plus tank water heater is the better fit. Sizing matters here, which is why we evaluate fixture count and usage pattern during the quote.
Yes, in nearly every case. Combi boilers work with the cast iron radiators, baseboard heat, and in-floor hydronic systems already in your home. The combi is the heat source, your existing radiators are the heat delivery, and they operate independently. We've installed combis in Capital Region historic homes where the original radiators are 100 years old and the combi is brand new, with zero compromise in heat performance.
We remove and dispose of it as part of the install. Once the combi is producing your domestic hot water, the standalone water heater is no longer needed. The water lines that fed it get reconfigured to feed from the combi instead. The basement square footage that the water heater was occupying becomes usable space again.
Combi installations typically have higher upfront equipment cost than a standard boiler replacement, but they often come out roughly equivalent or favorable when you factor in eliminating the standalone water heater that would otherwise need replacement separately. Over a 20-year lifespan, combi setups usually win the total-cost math through lower fuel bills and one unit replaced once vs two units replaced separately.
Often, yes. Most high-efficiency combi units qualify for New York State rebates and utility incentive programs (National Grid and NYSEG both run programs for high-efficiency heating equipment). Combi boilers fall into the same incentive categories as condensing boilers because they hit the 92%+ AFUE efficiency thresholds. We walk every combi quote through the current rebate landscape and help with application paperwork.
Most combi installations finish in 1-2 working days. Day one is typically removal of the old boiler and old water heater, plus initial install and venting work. Day two (when needed) covers commissioning, hot water testing, and balancing across zones. Heat is usually back on at the end of day one with hot water restored shortly after. We confirm the timeline in writing in the quote before install day.

Other Boiler Services

Not sure if a combi is the right fit? Here is the rest of our boiler service range.

Boiler Installation Boiler Replacement Boiler Repair Boiler Maintenance
The Modern Upgrade

Two Systems Out. One Combi In.

Get your basement back and run at 92-96% AFUE efficiency with on-demand hot water that never runs out. Combi installations across the Capital Region by licensed local techs.

Get A Combi Quote Call 844-MY-JOCKEY
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Get Your Combi Installation Quote

Tell us about your existing setup and your home. Our local team follows up with a flat-rate quote and an honest fit assessment.