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A Green Building Advisor forum post describes a Vermont cabin owner considering a small electric boiler for radiant heat in an insulated 600-square-foot home. The owner estimates a 4–6 kW unit may suffice, but the report provides no heat-loss calculation, installation plan, or operating-cost data.
A Vermont cabin owner is seeking advice on a 4–6 kW electric boiler to provide low-level radiant heat in the slab of a 600-square-foot home. The Green Building Advisor forum post describes a proposed system, not a completed installation, and does not include a heat-loss calculation confirming the owner’s size estimate.
The owner says the cabin is in southern Vermont and is very well insulated. The slab has 3 inches of XPS foam; the post describes continuous exterior insulation of 4 inches on the walls and 6 inches on the roof. The owner wants the radiant system to keep the floor just warm enough for comfortable feet during winter, rather than serve as the cabin’s only heat source.
The home already has a soapstone wood stove and a 12,000-Btu hyper-heat mini-split in its main living area, according to the post. The owner is considering electric partly because they expect a lower initial cost and need a compact unit in a space-limited home. They say local electricity rates are comparable to propane, but provide no rate figures or projected annual bills.
The owner acknowledges that alternatives, including a heat-pump water heater, may be preferable, but wants input on electric boilers and other homeowners’ experience. The material supplied does not identify a selected product, installer, construction timeline, or decision.
Sizing A Boiler For A Small Slab
The question highlights a practical issue for small, efficient homes: equipment size and purchase price are only part of the decision. An electric boiler’s suitability depends on the building’s design heat loss, the radiant system’s water-temperature requirements, electrical service capacity, and how the boiler would work alongside the existing stove and mini-split.
Those details matter even when the goal is supplemental floor warmth rather than full-house heating. A unit that is too large or poorly matched could add cost without meeting the owner’s expectations; a unit that is too small may not provide the desired heat in cold weather. The forum post does not establish which outcome applies here. Nor does the statement that electricity and propane rates are comparable establish which system would cost less to operate: consumption, equipment efficiency, and actual utility prices are not supplied.
The Cabin’s Existing Heat Sources
The owner presents the boiler as one part of a broader heating setup. The cabin has a wood stove for heat and a mini-split in the main living area, while the planned hydronic tubing would run in the insulated slab. The intended role is limited: maintain a modestly warm floor during winter.
The post says the owner has read earlier discussions about electric boilers and is aware of other options. It does not provide the cabin’s measured or modeled heat loss, floor-area layout, hydronic design, local electricity or propane tariffs, or a comparison of equipment and installation costs. Those missing figures prevent the proposed 4–6 kW range from being treated as a verified sizing recommendation.
Key Design And Cost Figures Missing
The supplied report does not say whether the owner received professional sizing advice or whether the project has progressed beyond considering options. It provides no heat-loss estimate, boiler model, electrical-service details, installation quote, or expected annual energy use. The suggested capacity therefore remains an estimate in the post.
It is also unclear how often the mini-split and wood stove would operate, what floor temperature the owner wants, or whether the radiant system would be designed to heat the cabin or only temper the slab. The statement that Vermont electricity rates are comparable to propane is attributed to the owner and is not accompanied by tariff data, a comparison period, or an operating-cost calculation.
Verify Loads Before Choosing Equipment
The next step described in the source is to gather feedback from people familiar with small electric boilers; it does not report a final choice. For a decision, the owner would need a room-by-room heat-loss calculation and a design for the slab system, including its intended role beside the mini-split and wood stove. An electrician or qualified heating professional could also check whether the existing electrical service and wiring can support the proposed equipment.
Comparing options would require actual equipment and installation prices, utility rates, and realistic estimates of how much heat each system would supply. Until those figures are available, the post supports reporting the owner’s question and priorities, but not a conclusion that a 4–6 kW boiler is correctly sized or less expensive to run.
Key Questions
Has the homeowner installed an electric boiler?
No installation is reported. The supplied material describes an owner considering options and asking for advice.
Is a 4–6 kW boiler confirmed to be the right size?
No. That range is the owner’s estimate. The post does not provide a heat-loss calculation or other design figures that would verify it.
Would the radiant floor be the cabin’s main heat source?
The owner says the goal is to keep the floor comfortable, while the cabin also has a wood stove and a 12,000-Btu mini-split. The post does not specify a full heating-load plan.
Does the report show that electric heat would cost less than propane?
No. The owner says electricity rates in Vermont are comparable to propane, but provides no prices, energy-use estimates, or operating-cost comparison.
What information is needed before choosing a boiler?
A professional heat-loss estimate, radiant-system design, electrical-service check, and comparison of installed and operating costs would help determine whether a boiler fits the cabin and its intended use.
Source: rss
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