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A GreenBuildingAdvisor reader asked about using a small electric boiler to provide low-level radiant heat in a well-insulated, 600-square-foot cabin in southern Vermont. The owner estimates a 4–6 kW unit may suffice, but no heat-load calculation or operating-cost comparison is provided, and the discussion excerpt contains no answer from other users.
A homeowner building a 600-square-foot cabin in southern Vermont is considering a 4–6 kW electric boiler to keep a radiant-heated concrete slab comfortably warm, while relying on a mini-split and wood stove for other heat. The question, posted to GreenBuildingAdvisor, describes a planned heating setup rather than a completed installation, and the supplied report does not include a confirmed heat-load calculation or response from other readers.
The cabin owner describes the building as very well insulated, with 3 inches of XPS foam beneath the slab, 4 inches of continuous exterior wall insulation, and 6 inches of continuous roof insulation. The home uses timber framing, and the owner says space is limited, making a smaller heating unit attractive.
The proposed boiler would serve hydronic radiant tubing in the slab. The owner says the goal is not to make radiant heat the cabin’s sole heating source, but to keep it at a low setting so the floor feels comfortable underfoot in winter. A 12,000-Btu hyper-heat mini-split is installed in the main living area, and a small soapstone wood stove is also available.
The homeowner estimates that a 4–6 kW boiler might meet the radiant system’s needs and says Vermont electricity rates are comparable to propane rates. Those points are the owner’s estimates and assessment; the source material does not provide utility bills, equipment pricing, a design heat-loss study, or measured performance data.
Sizing Heat for a Small Slab
The question matters to homeowners weighing upfront cost, equipment footprint and running costs in a small, highly insulated building. A compact electric boiler may appear attractive where space is scarce and the system is intended to provide supplemental floor warmth rather than carry the full heating load. But the owner’s proposed capacity cannot be confirmed from floor area and insulation descriptions alone.
A boiler’s suitability and electricity use depend on factors not given in the post, including the cabin’s calculated heat loss, local design temperatures, slab and tubing design, controls, and how often the mini-split or wood stove supplies heat. The owner also acknowledges that other options, including a heat-pump water heater (HWHP), could be considered, but is exploring electric resistance heat partly because of its anticipated lower initial cost and smaller size. The source does not establish which option would be less expensive over time.
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The Cabin’s Planned Heating Mix
The post is a request for advice on a specific project, not a report of a boiler purchase or a completed heating-system evaluation. The owner says electric boilers have been discussed previously on GreenBuildingAdvisor and asks for insight relevant to this cabin’s size, insulation and limited mechanical space.
The proposed radiant system is only one part of the plan. The cabin also has a 12,000-Btu mini-split in its main living area and a soapstone wood stove. The homeowner says the radiant slab would be kept relatively low, with comfort underfoot as the aim. The supplied account does not specify whether the boiler would provide backup heat, how the three heat sources would be controlled, or how much each would be used.
“My intention with the radiant is to keep it relatively low, but just warm enough to have comfortable toes on the floor in the winter.”
— The cabin owner, in the GreenBuildingAdvisor question
small hydronic electric boiler 4kW
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Boiler Capacity and Costs Unverified
The supplied source does not say whether the owner received replies, selected equipment or installed the system. It also gives no heat-loss calculation to support the suggested 4–6 kW capacity, and no details on the radiant tubing layout, water temperatures, boiler efficiency, electrical service capacity or controls.
Actual operating costs are also unresolved. The homeowner’s statement that electricity and propane rates are comparable is not accompanied by rates or a comparison of delivered heat. The post does not establish how the electric boiler would compare with the mini-split, wood stove or a heat-pump-based system in purchase price or seasonal energy use. Those conclusions would require project-specific information not present in the report.
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A Heat-Loss Study Would Guide Selection
The next practical step for the owner would be to establish the cabin’s design heat loss and confirm that the proposed boiler, radiant slab and electrical supply are compatible. A project-specific comparison of installed cost and expected energy use could then assess electric resistance heat against alternatives, using actual local utility rates and the intended operating schedule.
Until those details or a follow-up from the homeowner are available, the 4–6 kW figure remains a preliminary estimate, not a confirmed recommendation. The supplied material does not report a final equipment choice or installation outcome.
electric radiant floor heating system
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Key Questions
Has the Vermont homeowner installed an electric boiler?
The supplied GreenBuildingAdvisor material presents a question about a proposed system. It does not confirm a purchase or installation.
Is a 4–6 kW boiler confirmed to be enough?
No. That range is the owner’s estimate. The source does not include a heat-loss calculation or other information confirming the required capacity.
What other heat sources does the cabin have?
The owner reports a 12,000-Btu hyper-heat mini-split in the main living area and a small soapstone wood stove, alongside the proposed radiant slab system.
Are electric boiler operating costs known for this cabin?
No. The owner says Vermont electricity rates are comparable to propane rates, but the post provides no price figures, usage data or cost comparison for this home.
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