Radiant Heating near you

The emitter is what actually heats the room, and swapping one type for another changes the water temperature the system needs, the response time and sometimes the piping. Identify what you have before pricing anything.

Radiant systems are quiet, they do not blow dust around, and they zone well, which is why owners of older hydronic houses are often reluctant to give them up. The trade-off is that the house has no air distribution, so three jobs a forced-air system does incidentally have to be solved on purpose.

Cooling is the first. A radiator cannot cool, so central air conditioning in a hydronic house means either adding a duct system, which is a major project in a finished home, or installing ductless equipment room by room. The second is filtration: there is no central blower drawing house air through a filter, so any air cleaning has to be done by portable units in the rooms that need them. The third is ventilation, which in a tight house has to come from dedicated equipment rather than from a furnace fan that is not there.

The upside is control. Hot water heating zones easily, and DOE's Building America guidance on gas-fired boilers calls for designing an efficient zoned distribution system with a compact piping layout, insulated pipes, and correctly sized equipment for the radiators, baseboards, convectors or radiant floor loop system. A house with three real zones and emitters sized to the rooms behaves very differently from one where every room is on a single loop and the coldest room sets the thermostat.

Uneven heat is the defining complaint of older radiant systems, and on steam it has a specific and fixable cause. DOE's Building America guidance on steam system balancing describes the mechanism: air fills the pipes and radiators when a steam cycle ends, and when the boiler starts again the expanding steam must push that air out so steam can reach the radiators. If the air cannot get out fast enough, the steam never arrives.

The guidance is direct about what is usually wrong. Most steam systems have vents that are too small, and many systems lack vents entirely, which leaves distant rooms underheated. The remedy it describes is to install master vents on the mains and risers to let out air trapped in the pipes, and to fit slow radiator vents so the system balances rather than overheating the nearest rooms. It also names the consequence of not doing it: with unbalanced steam systems, owners are often forced to overheat most of the building in order to provide sufficient heat to a handful of underheated areas. Dry steam, meaning steam that contains few entrained water droplets, is described as needed for all steam systems and a critical part of successful steam balancing.

Hot water systems fail differently. There the usual suspects are air trapped at the high points, a stuck or wrongly set balancing valve, a circulator that is not moving what the design assumed, an emitter undersized for a room that has since been extended or opened up, or supply water temperature reduced for efficiency without the emitters being enlarged to match. Each has a different fix, and none of them is a bigger boiler.

Hydronic work is governed by the mechanical provisions of the residential code your state adopts, and the language is usefully specific. In the hydronic piping chapter as published by Seattle, baseboard convectors shall be installed in accordance with the manufacturer's instructions and shall be supported independently of the hydronic piping, which is the rule behind every sagging baseboard enclosure hanging off its own pipe.

Pressure testing is prescribed rather than optional. The same chapter requires hydronic piping systems to be tested hydrostatically at a pressure of one and one-half times the maximum system design pressure, but not less than 100 pounds per square inch, with each test lasting not less than 15 minutes. It also sets hanger spacing by material, prohibits reusing pipe, fittings and valves in hydronic systems, and requires that any antifreeze or other material added to the system be chemically compatible with the pipe, tubing, fittings and mechanical systems.

There is a clearance rule worth knowing before anything is boxed in: a pipe in a hydronic system with an exterior surface temperature exceeding 250 degrees Fahrenheit must have a clearance of not less than 1 inch from combustible materials. Code editions and local amendments differ between states, so confirm which edition your jurisdiction enforces rather than assuming the version quoted here applies at your address.

Radiant emitters are hot surfaces in occupied rooms, and the US Fire Administration's instruction covers them explicitly: keep anything that can burn at least 3 feet from all heat sources including fireplaces, wood stoves, radiators, space heaters or candles. USFA reports that heating fires remained the second leading cause of home fires in 2021, with an estimated 32,200 home heating fires reported to fire departments in the United States.

Electric baseboard deserves particular care because it is so easy to furnish over. Curtains that reach the floor, a bed pushed against the wall, a laundry basket, a rug edge or a sofa back set against a baseboard heater all put fuel against a heating element. Electric heaters also draw heavily and are normally wired on their own circuits, so adding one is electrical work with a permit and an inspection rather than a plug-in purchase.

Surface temperature matters for people as well as furnishings. Cast-iron radiators on steam run hot enough to burn a child or an unsteady adult on contact, and radiator covers, guards and low-temperature emitters are all legitimate answers in a house with small children, elderly residents or anyone with reduced sensation. Ask about surface temperature during design rather than discovering it in January.

Heating licensure in the United States is set state by state, and in several states hot water and steam work is licensed apart from forced-air work. California is the clearest illustration: the Contractors State License Board maintains a C-4 Boiler, Hot Water Heating and Steam Fitting classification covering low pressure boilers, steam fitting and piping, pumps, radiators and convectors, distinct from the C-20 classification that covers warm-air heating, ventilating and air-conditioning. A contractor licensed for one is not automatically licensed for the other.

Elsewhere the work may fall under a plumbing, mechanical or general contractor license, and some states leave it to cities. Electric baseboard and radiant panels are a different question again, since the connection is electrical work under your state's electrical licensing and typically needs a permit and an inspection. Ask which classification covers the specific work you are buying, then verify the number with the issuing board rather than with the company.

Permits are usually local. Replacing emitters on an existing loop may need nothing, while altering the piping, adding zones, changing the heat source or running new electrical circuits generally does. Settle in writing who pulls the permit, whether its cost sits inside the quote, and who meets the inspector.

Radiant quotes diverge on design far more than on hardware. The variables are how many emitters are involved and whether the existing piping layout can serve them, whether the system is steam or hot water, the supply water temperature the heat source can deliver and therefore how large the emitters have to be, how many zones are being created and what controls they need, how much of the piping is accessible or buried in finished walls and ceilings, whether asbestos-era pipe insulation is present and has to be assessed before anything is disturbed, and whether electrical work and permits are part of the scope. Ask for the emitter schedule and the design water temperature, and two bids become comparable.

LokalMatch is where it begins. You describe the system once: steam or hot water, what the emitters look like, which rooms never warm up, what the heat source is, and what you are trying to change. Heating contractors serving your area receive the request and the interested ones contact you directly. Pros pay for the requests they receive, and the service costs homeowners nothing. LokalMatch does not install or service heating systems, does not set prices, and does not vet, rank or recommend any contractor, so checking the state classification, insurance and the written scope stays with you.