Frequently Asked Questions

Answers to the questions Maine and New Hampshire homeowners most often ask us about hydronic boiler and combi systems, rebates and financing, installation, scheduling, and warranties. Have a question that isn’t covered here? Contact us and we’ll get you a straight answer.

Hydronic Boiler & Combi System FAQs

What is a hydronic boiler system, and how does it heat a home?

A hydronic system heats your home by circulating heated water through a sealed network of pipes to copper baseboards, cast-iron radiators, or radiant in-floor grids, delivering steady, radiant warmth without blowing dry air, dust, or allergens around your living space. Modern hydronic systems use modulating gas burners that dynamically match your precise heating demand, which lowers fuel consumption.

What is a combination (“combi”) boiler?

A combi boiler provides both whole-house space heating and on-demand domestic hot water from a single wall-mounted unit, eliminating the need for a separate water heater tank and freeing up mechanical room space. It offers endless hot water by using domestic hot water priority, instantly shifting all BTU output to your taps the moment a faucet opens.

Why is an oversized boiler bad for a heating system?

An oversized boiler short-cycles — turning on and off rapidly — which accelerates equipment wear, strains internal components, and increases fuel bills because the system burns excess energy ramping up without running long enough to reach peak efficiency. We use accurate Manual J load calculations to size equipment exactly to a home’s square footage, piping layout, and heat loss profile.

Why are boiler piping and venting layout so critical?

Incorrect near-boiler piping destroys system efficiency, starves zones of correct flow rates, and can cause premature thermal shock to cast iron, while high-efficiency condensing units require specialized PVC, CPVC, or polypropylene venting to safely drain acidic flue condensate. Proper layouts maintain the correct Delta T (temperature difference) between supply and return lines to optimize heat transfer and protect the heat exchanger.

How often do hydronic systems require professional maintenance?

We recommend professional boiler maintenance once a year, before the heavy winter heating season begins. Annual check-ups include testing the expansion tank, checking system pressure, flushing out sediment debris, and cleaning sensors — deferring yearly maintenance leads to unexpected winter breakdowns, component corrosion, and can void manufacturer warranty protections.

What is the difference between concentric and two-pipe venting?

Two-pipe venting uses two separate pipes — one pulls fresh combustion air from outside and a second expels exhaust gases. It’s highly flexible for long runs but requires drilling two holes through your home’s exterior wall. Concentric venting uses a “pipe-within-a-pipe” design, where the inner pipe carries hot exhaust gases out while the outer pipe draws fresh air in; it only requires a single exterior wall penetration and preheats incoming air for slightly better efficiency.

How does local water hardness affect my boiler, and how do you protect it?

Hard water contains high levels of calcium and magnesium that bake onto the hot internal surfaces of your heat exchanger, creating an insulating layer of scale that reduces heat transfer, forces the boiler to work harder, and can eventually cause the heat exchanger to overheat and crack. To protect your investment, we perform a water hardness test during every evaluation and install an inline scale inhibitor to treat the water before it enters your equipment. Most manufacturers require water quality to fall within strict limits — typically under 7 to 12 grains per gallon — and our inline treatment solutions help keep your installation compliant so your parts warranty stays valid.

Rebates, Financing & Tax Credit FAQs

What federal tax credits can I claim for upgrading my heating equipment?

As of August 2026, recent updates to federal law under Public Law 119-21 have eliminated the Section 25C residential energy efficiency tax credits for new installations placed in service after December 31, 2025. If your high-efficiency system was fully installed and operational on or before December 31, 2025, you can still claim your 30% credit — capped at $600 for high-efficiency boilers and up to $2,000 for qualifying heat pumps — on your current tax filing using IRS Form 5695. Commercial buildings and multi-family projects may still qualify for structural incentives like the Section 179D tax deduction or Section 45L credit for qualifying high-efficiency infrastructure.

What rebates are available through Efficiency Maine for my heating upgrades?

Efficiency Maine structures cold-climate heat pump rebates by household income tier: any income level qualifies for up to $1,000 per outdoor unit (capped at $3,000); moderate-income households (individual filers up to $70,000, joint filers up to $100,000) qualify for up to $2,000 per outdoor unit (capped at $6,000); and low-income households enrolled in programs like HEAP, SNAP, TANF, or MaineCare qualify for up to $3,000 per outdoor unit (capped at $9,000). A qualified whole-house heat pump conversion adds a $500 bonus, and upgrading to an advanced pellet or wood-fired hydronic boiler is covered at 1/3 of project cost up to $6,000. Our team provides your finalized installation invoice and matching AHRI certificates to help you apply, but you submit the rebate paperwork directly through the Efficiency Maine Customer Portal — final approvals and incentive disbursements are controlled entirely by Efficiency Maine or the independent program administrators, and we don’t guarantee any utility or state rebate.

Are there any fossil-fuel heating oil rebates available?

The Maine Energy Marketers Association (MEMA) coordinates NORA-funded rebate pools that, during active budget windows, provide up to $450 for upgraded higher-efficiency oil heating systems and $300 for new heating oil storage tanks. Funding for fossil fuel equipment is highly cyclical, so our team verifies active program funding levels at the time of your estimate to help you secure every dollar available.

What financing options are available through the state-backed Efficiency Maine Green Bank?

The Efficiency Maine Green Bank offers unsecured loans up to $25,000 with no home liens required: a 1-year option at 0% APR (with a $500 origination fee spread over 12 months), a 5-year option at 5.99% APR fixed with no origination fees, a 10-year option at 7.99% APR fixed for the lowest monthly payments, and an income-based option for qualified low- and moderate-income households offering a 10-year, 5.99% APR tier for unsecured loans up to $7,500.

Can I finance my new boiler system through NEIF?

Yes — we’re an approved contractor partner with the National Energy Improvement Fund (NEIF), a certified B-Corp, which is a good fit for equipment configurations that fall outside Green Bank parameters. NEIF’s EnergyPlus Loans are simple-interest, fixed-rate installment loans from $2,500 up to $50,000 with no prepayment penalties, and qualifying tiers offer competitive rates such as 8.99% APR for credit scores over 700.

Installation, Prep & Recycling FAQs

How long does a typical boiler installation take?

A standard installation combining a new high-efficiency boiler with an indirect water heater typically takes 4 days from start to finish. We plan the mechanical transition carefully so your home experiences minimal downtime for heat and hot water — this timeframe covers everything from removing your old equipment and modifying the near-boiler piping layout to installing your inline scale inhibitor, venting, and testing the entire system.

How should I prepare my mechanical room before installation day?

Please clear all personal belongings within 5 feet of the boiler before our crew arrives on day one, and make sure there’s a wide, unblocked path from the entry door to the heating equipment so our technicians can safely transport heavy machinery. For safety, keep children and pets away from the active installation zone while our team is working with tools and piping.

What happens to my old heating equipment after it’s removed?

We partner directly with Pine State Dump Runners in Windham, Maine, to safely haul away your old boiler and water heater tanks. Your old mechanical components are transported to dedicated facilities to be broken down and recycled, keeping scrap metal out of local Maine landfills — removal, clean-up, and recycling are fully included in your standard installation package.

Maine Consumer Protection & Your Contract

What legal provisions must be included in my installation contract under Maine law?

For any home construction or home improvement project valued at over $1,400, Maine’s Home Construction Contracts Act requires a written contract signed by both parties before work begins. Per the Maine Attorney General’s Consumer Protection Rules, your contract must include: the complete names, addresses, and phone numbers of both contractor and homeowner; the exact project location; an estimated start and completion date; a clear, itemized description of the work, materials, and boiler models involved; a full statement of the total price and payment terms; a description of consumer warranties, including our 2-year company labor warranty and its annual service agreement requirement; a clause informing you of your right to seek assistance through the Maine Attorney General’s mediation programs if a dispute arises; and a requirement that any changes to the scope of work be documented in a signed, written change order before that extra work begins.

Service Scheduling & Dispatching FAQs

How do I schedule a non-emergency repair or routine tune-up?

The fastest way to book a maintenance appointment or diagnostic visit is through our online booking calendar, where you can view open slots and pick a time that fits your day. You can also call our office directly during normal business hours, Monday through Friday, 8:00 AM to 4:30 PM. Saturdays are available by appointment for routine tune-ups or planned maintenance — contact our office during the week to secure a weekend slot. When scheduling, please have your address, the approximate age of your boiler, its fuel type (gas, propane, or oil), and a brief description of the symptoms you’re noticing ready.

What should I expect once my service appointment is confirmed?

We use 2-hour arrival windows (for example, 8:00 AM–10:00 AM) so you don’t have to wait around all day for our truck to arrive.

How do you handle emergency system failures and after-hours calls?

If you experience a complete loss of heat during freezing winter weather, a major water leak, or smell gas, call our emergency line right away — we maintain a live, local answering service every hour of the year, with dedicated technicians on call throughout Maine and New Hampshire every night, weekend, and holiday. Active members of our annual maintenance agreement receive automatic priority dispatch, jumping to the front of the emergency service queue during major regional cold snaps.

Warranty & the Brands We Install

What warranty comes with a new boiler installation?

We back our installation craftsmanship with a 2-year labor warranty on every new boiler configuration we install, valid on properties across both Maine and New Hampshire. To take advantage of this coverage, clients are required to sign an annual maintenance agreement; if an eligible installation issue arises within your first two years while your agreement is active, we diagnose and fix it at zero out-of-pocket cost to you.

What high-efficiency boiler brands does Local Energy install, and what makes them different?

We install and service several manufacturer lines, each with factory-backed training and its own strengths:

Viessmann Vitodens 100-W (B1HE/B1KE): A gas-fired, wall-mounted condensing boiler. Our team is factory-trained directly by Viessmann. It features a titanium-stabilized Inox-Radial stainless steel heat exchanger for exceptional corrosion resistance, a 10:1 modulation turndown ratio to reduce cycling and fuel wear, and an integrated Wi-Fi interface for remote monitoring via the ViCare app. It carries a 10-year warranty on the heat exchanger and a 5-year parts warranty upon successful online registration.
Bradford White Brute FT: We’re a factory-recognized “For the Pro” contractor for Bradford White, with advanced tool training and diagnostic access. It uses a durable stainless steel fire-tube heat exchanger with a self-contained 40-foot corrugated domestic hot water coil and a 10:1 turndown ratio. It carries a 10-year warranty on the heat exchanger and a 1-year limited parts warranty.
Navien NHB-H: Our team is a factory-designated Navien Service Specialist (NSS). It delivers 95% AFUE efficiency using dual stainless steel heat exchangers, an industry-leading 15:1 modulation turndown ratio (matching demand down to 10,000 BTUs), and a built-in controller with a timed hydronic supply boost for extreme cold snaps. It carries an industry-leading 15-year warranty on the heat exchanger and a 5-year residential parts warranty.
Lochinvar Knight®, Noble®, and EPIC®: We’re factory-trained by Lochinvar on the Noble and EPIC combi boiler lines. The Knight is a dedicated space-heating boiler built around a stainless steel fire-tube heat exchanger, rated at 95% AFUE with a 10:1 modulation turndown ratio, available in natural gas or propane models spanning roughly 55,000 to 399,000 BTU/hr, and backed by a 15-year heat exchanger warranty and 5-year parts warranty. The Noble and EPIC are Lochinvar’s residential combination boilers, each delivering both space heating and domestic hot water (up to 4.8 GPM at a 77°F rise) from a single fire-tube unit at 95% AFUE, with patent-pending controls designed to eliminate the cold-water “sandwich” common to combi boilers when switching between heating and hot water modes. Both carry a 10-year heat exchanger warranty and 5-year parts warranty; the Noble is additionally ENERGY STAR qualified.

Looking specifically for oil-fired equipment? See our dedicated Oil Boiler FAQs page, covering Slant/Fin, Buderus, Saint Roch, Weil-McLain, Energy Kinetics, New Yorker, Burnham, Viessmann, PurePro, and Laars.

Ready to Schedule Your High-Efficiency Upgrade?

How do I request a free on-site estimate for my boiler replacement?

Fill out our online contact form with your name, phone number, and email; your property’s street address (check our Service Areas page first to confirm we serve your town); your current fuel type and heating delivery method (baseboards, cast-iron radiators, or radiant in-floor grids); your project goals, such as an indirect water heater, radiant flooring lines, or a straight boiler swap; and your preferred scheduling windows. Our office team will reach out within 24 business hours to finalize your appointment.