Hot Water Recirculating System

This article indicates a slab home requires a system with a pump. The Hot Water Lobster System (pumpless)web site doesn't say anything about not being applicable to a slab home. Who is correct?

Don,
I don't make claims for products. You need to contact the lobster people and ask them about their limitations.

I contacted Lobster and they say the system will function properly in a slab home.

The HWL didn't work in our home. Lobster said it was because we had check valves in our water system or hot water heater (no according to AOSmith) which I could never substantiate. Now I'm reluctant to try anything including those that have a pump. Tony, you've endorsed it, but is this on HWL's theory or do you have one in your home?

i work in a nursing home and we have installed chemical mixing stations in all of our janitor closets and now my hot water is really inconsistant. why would these stations cause a problem and is there another way to fix this without pulling the stations??

I'd like to know which one is better;
a Redytemp hot water circulator pump or
a Hot Water Lobster pump.
I have a ranch style house 2200'

Just wanted to say that I followed your direction and it worked great.
who ever built my house placed the hot water as far from the kitchen and bathrooms as they could. from turning on the shower and waiting a couple of minutes to instant hot water.

dear sir, i am a corgi registeed engineer and have been for the past 4 years and plumbing experience of 9 years. i have been contacted by an owner of an old peoples nursing home and they have asked me to have a look at their hot water system. the problem they have is that when there is a high demand of hot water, ie in the morning, the hot water doesnt retain its tempreture. they want the system changed. the boiler they have is only 2 years old but the hot water tanks are 10-15 years old, and they want them changed to something new. the 2 hot water tanks they do have are each the size of a small boxed room, and while inspecting the tanks i assume them to be running of the cold mains, or possible they do have header tanks on the roof somewhere. so it might be an unvented or vented system. the tanks work on a simple where the hot water is heated indirectly by the boiler, which a 90kw boiler. there are hundreds of pipes coming off the tanks which is a bit confusing, i didnt have much time to inspect the system, but im sure if i get the job ill figure what each pipe is for. what i need to know what new hot water system can be fitted to the exsisting boiler. the nursing home has about 45 rooms with a small sink in each room, hot and cold water, and 7 individual bathrooms, with the odd sink in the utiliy room , in the staff kitchen and maybe a hot supply going to the washing machines. do i get rid of the 2 huge tanks and replace them with the biggest unventer tank availiable, with an external plate heat exchanger? or is there another system i can use. please can u provide3 me with some helpful information on exactly what i ned to do, or maybe a web site i can get information from. i realy need this contract so please can you help. a prompt response will be much appritiated, thank you

I live in Florida. Most of the homes here are on cement slabs. Myself and one of my neighbors installed a Hot Water Lobster Instant Hot Water Valve in our homes almost three years ago now. Our systems have been working great.