Stepping onto the warm bathroom floor offers a unique sensory experience. It’s not just about convenience. It’s a special peace that can only be found with radiant heat. Installing an electric radiant heating system under the tiles is a popular option for homeowners planning renovations or new construction. Installation is very easy. Place the plastic heating mat under the floor and cover it with the tiles of your choice. The mats are typically made of heat-resistant polyethylene and have loops of resistance wire. When energized, the wires transfer heat directly to the tiles, which radiate heat into the room within an hour. It works like an electric blanket, except without the fabric.
But this is an obstacle. You may have heard warnings about sleeping with an electric blanket overnight due to potential health risks. If this is true, does the same logic apply to underfloor heating (RFH) systems? The heat itself is not a concern. It’s an electromagnetic field, or EMF, which is an invisible byproduct of electricity.
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Understanding the Invisible Field
All devices plugged into the wall or powered by batteries emit some electromagnetic field. Microwave ovens, clock radios, hair dryers and floor lamps all affect the surrounding electromagnetic environment. The question is not whether floor heating systems emit electromagnetic fields. The question is whether such exposure is dangerous.
To answer this question we need to understand what exactly EMF is. This is a combination of two different forces created by alternating current (AC). The electric field is controlled by the voltage and it sends current through the conductor. The magnetic field is controlled by an electric current, and the amount of electricity flowing through it is measured. These fields radiate from the device itself and the wires that power it.
High-Tension Comparisons
Not all EMFs are the same. The strongest sources are often outside the home. High-voltage lines and transformers emit large amounts of radiation. Transformers are cylindrical boxes on top of utility poles or large green boxes near roads that step down large amounts of voltage to safe levels for residential use. New research shows a link between proximity to high-voltage power lines and an increased incidence of childhood leukemia. Although science has yet to provide clear evidence, most health experts agree that avoiding long-term exposure to high doses of electromagnetic fields is a precautionary measure.
This leads to unpleasant comparisons. Are clock radios and electric shavers dangerous if they emit electromagnetic fields? And furthermore, do new underfloor heating systems pose a similar risk? Although we have not yet reached a definitive conclusion, understanding the source of the field is the first step in assessing risk. In the next part of this study, we will take a closer look at whether the electromagnetic field of radiant heating in residential buildings goes from a nuisance to a health risk.
We know that alternating current produces electromagnetic fields (EMF). This is a physical fact. But does running a blender or tumble dryer really shorten your lifespan? The science isn’t clear yet.
According to current standards, long-term exposure to weak electric fields is generally considered harmless. Weak magnetic fields are even trickier. There is no direct evidence that they are associated with poor health, but they cannot be ruled out either. There are many unknowns about long-term exposure.
What the Research Says About Health Risks
动物研究表明，长期暴露在磁场中会改变激素和酶的水平。 这对健康有风险吗？ 未必。 但研究人员仍在研究这些变化是否会在数十年的接触中导致癌症。
人类研究更难进行。 癌症有很多原因。 您无法将电磁场暴露视为单一罪魁祸首。 另外，接触潜在致癌物和疾病出现之间存在很长的滞后时间。 这个休眠期使得结论性数据难以收集。
到目前为止，测试表明弱电磁场暴露与癌症之间没有联系。 2004年，加拿大卫生部审查了这些数据。 他们发现电气设备和电源线确实会在体内感应出微弱的电流。 然而，这些电流小于您自己的大脑、心脏和神经产生的自然电脉冲。 没有已知的健康风险与它们相关。
为什么仍然建议谨慎
如果科学表明风险较低，为什么健康专业人士建议避免近距离、长时间接触？
- 不要连续几个小时坐在离电视太近的地方。
- 避免直接站在运行的微波炉前，尤其是怀孕时。
- 不要睡在加热的电热毯下。
逻辑很简单。 预防是廉价的。 有些电器发出的磁场比其他电器更强。 我们知道所有微波炉都会泄漏电磁场。 当他们操作时，站在几英尺之外是有意义的。 电热毯产生的电场可穿透身体六到七英寸深。
如果测试结果稍有模糊，合理的避免也是有道理的。 这与恐慌无关。 这是关于如何巧妙地利用您的环境。
Choose safe underfloor heating
This brings us to electric radiant floor heating (RFH). Most manufacturers carefully protect the wires to prevent health hazards.
Americans are typically exposed to magnetic field strengths of less than 1 microtesla every day. An unprotected radiant floor system emits 20-40 times this amount. This is a big difference.
There is only one unbiased third-party test for radiant floor heating EMF levels. This is called the Radiant Electrical Emissions Test (REET). Many companies claim that their systems are secure because they do their own testing. These claims are often questionable. Only systems that pass the REET program can claim to be secure.
How do the testing methods differ from each other?
Note how the test is done. Many manufacturers only measure electromagnetic field levels from a few points several feet above the floor. At this point, your feet are not touching the heating pad.
REET procedures are stricter. Test 20 different points just 0.5 inches (1.27 cm) above the mats. This more accurately simulates real situations.
When you purchase an RFH system, you will see marketing labels such as “Zero EMF” or “EMF Free”. These terms are often ambiguous. If you are concerned about exposure, pay close attention to REET certification.
For more information on carcinogens in home renovations, go to the resources on the next page.
