Keene, NH & the Monadnock Region Emergency service · 603-762-1548
Allegiant Plumbing & Heating LLC 603-762-1548
Boiler Room

Heating Systems

Boilers, baseboard, radiant, and the gas piping that feeds it all. Built for a real New England winter.

Heating Systems
The short version

What to expect

Heat is not a luxury here, it is the difference between a house and a liability. We install and service the systems that carry a Monadnock winter: oil, gas, and propane boilers, fin-tube baseboard, radiant floors, and the near-boiler piping that quietly decides whether any of it works well. Sizing matters more than brand. We calculate the heat loss for your building instead of copying the nameplate off the unit we are removing, which is how oversized boilers keep getting installed and how homeowners keep paying to short cycle all winter.

Call 603-762-1548

Boiler Installation and Replacement
Replacement

Boiler Installation & Replacement

A boiler limping through January will not survive February. We replace oil, gas, and propane boilers with correctly sized units, new near-boiler piping, and controls that get set up rather than ignored.

High-Efficiency Heating Systems
Installation

High-Efficiency Heating Systems

Condensing boilers and modulating burners spend most of the season at partial load, which is exactly where the savings live. We match equipment to your building's heat loss, not to the old nameplate.

Baseboard Heating
Repair or addition

Baseboard Heating

Fin-tube that is crushed, painted shut, or airbound gives up half its output. We replace elements, purge and rebalance zones, and add loops so the cold room stops being a family negotiation.

Radiant Heating
Design and install

Radiant Heating

Warm floors, quiet rooms, no dust pushed around. We design and install radiant tubing in slabs, staple-up, and panel systems with manifolds and mixing valves set for even, efficient, low-temperature heat.

Propane Piping and Gas Appliance Connections
Install and pressure test

Propane Piping & Gas Appliance Connections

Ranges, dryers, fireplaces, generators, and grills. We run and pressure-test propane and natural gas lines, size them for the actual connected load, and document the test so inspection is uneventful.

On video

Inside a finished mechanical room

A new build in the Monadnock Region: tankless unit, indirect tank, and a manifold labeled and valved so the next service call is a ten-minute job.

Mechanical room walkthrough

No heat? No water? Call now.

Frozen lines, failed boilers, and burst pipes do not wait for business hours. Neither do we.

Call 603-762-1548