Up to 60% lower fuel cost
Condensing boilers extract heat from exhaust gases that older units waste. Owners upgrading from fuel oil routinely cut annual heating bills by half.
Service 01
High-Efficiency Gas Boilers & Hydronic Heat
A properly sized condensing boiler is the most cost-effective way to heat a Northeastern Minnesota home — quieter, cleaner, and up to 60% cheaper to run than fuel oil. Design Heating installs and services high-efficiency gas and propane boilers across Duluth, Hermantown, Proctor, Cloquet, Two Harbors, and Superior, WI.
Overview
Custom-Designed for Duluth Homes
High-efficiency boilers are our specialty. If you have a fuel oil boiler or an older inefficient unit, upgrading to a condensing gas or propane boiler can cut your fuel costs by 60% at current prices. Every system we install is sized with a computerized Manual J heat loss calculation to ensure you get the right boiler for your home.
- Fuel oil to natural gas/propane conversions
- High-efficiency condensing boiler installation
- Hydronic system design and piping layouts
- 60% lower operating cost vs. fuel oil
Why Choose This System
Engineered Benefits, Not Sales Pitches
Sized by Manual J — not by guess
We run an ACCA-approved Manual J heat-loss calculation on every project so your boiler is matched to the actual envelope of your home.
Cleaner combustion
Direct-vent natural gas and propane boilers vent through a sidewall PVC pipe — no chimney liner, no soot, no oil delivery trucks.
Quiet, even comfort
Hydronic heat eliminates the temperature swings and dry air of forced-air systems and runs silently in the background.
Our Process
How a High-Efficiency Boilers Project Works
Every job follows the same documented workflow — from heat-loss calculation to final commissioning.
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1. In-home assessment
We measure your home, inspect existing piping, and review your fuel options (natural gas, propane, electric).
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2. Manual J + system design
We calculate the exact BTU load, size the boiler, design the near-boiler piping, and quote a fixed price.
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3. Installation
Most boiler swaps are completed in 1–2 days. We pull permits, handle inspections, and protect your home.
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4. Commissioning & training
We measure combustion, set outdoor reset curves, and walk you through the thermostat and controls.
Credentials
Owner-Installed, Owner-Accountable
Kevin Kaski personally designs and installs every Design Heating project — no sub-contractors, no rotating crews.
License
MN MB715020
Minnesota Licensed & Bonded
Geothermal
CGD Certified
IGSHPA Accredited Trainer & Installer
Engineering
Manual J + LoopCad
Every system sized by calculation, not guess
Reputation
4.9 ★ · 114 reviews
BBB Accredited · Founded 2016
Service Area
Where We Install High-Efficiency Boilers
Design Heating is based in Duluth, Minnesota and serves homeowners throughout Northeastern Minnesota and Northwestern Wisconsin — typically within a 30-mile radius of our shop on Washburn Road.
Design Heating, LLC5131 Washburn Road
Duluth, MN 55803
(218) 525-5914
- Duluth, MN
- Hermantown, MN
- Proctor, MN
- Pike Lake, MN
- Cloquet, MN
- Esko, MN
- Carlton, MN
- Two Harbors, MN
- Superior, WI
Frequently Asked Questions
High-Efficiency Boilers — Common Questions
Most residential boiler installations in the Duluth, MN area fall between $9,000 and $18,000 depending on the size of your home, the fuel type (natural gas vs. propane), and whether existing piping can be reused. After a free in-home Manual J calculation we provide a fixed, written quote — no surprise charges.
In almost every case, yes. At current Duluth-area fuel prices, a condensing gas or propane boiler operates at roughly 40% of the cost of fuel oil. Most homeowners recover the installation cost within 4–7 winters through fuel savings alone, and they no longer have to schedule oil deliveries.
For new boiler installations in Minnesota, look for an AFUE (Annual Fuel Utilization Efficiency) rating of 95% or higher. We typically install boilers rated 95–98% AFUE from manufacturers like Viessmann, Lochinvar, and Navien.
A straightforward boiler swap (same fuel, similar capacity) is usually completed in 1–2 working days. A fuel-oil-to-gas conversion or full hydronic redesign typically takes 3–5 days. We give you a written timeline before work begins.
Yes, in most cases. Modern modulating-condensing boilers are designed to operate efficiently with both high-temperature cast-iron radiators and low-temperature infloor systems. We verify temperature requirements during the design phase.
Yes, we service and repair existing boilers throughout the Duluth area. Annual maintenance is recommended to keep the unit running at peak efficiency and to maintain manufacturer warranties.
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Free in-home consultation, Manual J heat-loss calculation, and a written, itemized quote — every time.